improve how markdown code language is commented

We added a space between the markdown triple code mark
and language that was enclosed in HTML comments.

So a line of the form:

````
```<!---c--->
````

became:

````
``` <!---c--->
````

This was done to **help** some code see that the HTML comment
string was not a markdown code specifier.   Not all code
understands this after this changed.  For example, `pandoc(1)`
still forms HTML classes of the form "&lt;!---c--&gt;"
when it encounters the above mentioned change.

We also fixed a problem with `2019/dogon/README.md` regarding
a markdown code block.

We also fixed a problem with `2020/yang/README.md` regarding
a markdown code block.

1989/fubar/README.md

@@ -1,6 +1,6 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
@@ -18,14 +18,14 @@ For more detailed information see [1989 fubar bugs](../../bugs.html#1989_fubar).
 
 ## To use:
 
-```<!---sh-->
+``` <!---sh-->
     ./fubar <number>
 ```
 
 
 ## Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./try.sh # run on 1 - 7
 
     ./fubar.sh 2 # run via script

1989/jar.1/README.md

@@ -2,7 +2,7 @@
 
 NOTE: this will run the program itself.
 
-```<!---sh-->
+``` <!---sh-->
     make clobber all
 ```
 
@@ -12,7 +12,7 @@ See the [Alternate code](#alternate-code) section below for more details.
 
 ## To use:
 
-```<!---sh-->
+``` <!---sh-->
     ./jar.1
 ```
 
@@ -26,14 +26,14 @@ This alternate code, which prints something slightly different, is provided as w
 
 NOTE: this will run the program itself.
 
-```<!---sh-->
+``` <!---sh-->
     make clobber alt
 ```
 
 
 ### Alternate use:
 
-```<!---sh-->
+``` <!---sh-->
     ./jar.1.alt
 ```
 
@@ -43,7 +43,7 @@ NOTE: this will run the program itself.
 On many systems the compiler will not allow you to send the object file to
 `/dev/tty`.  The author suggested:
 
-```<!---sh-->
+``` <!---sh-->
     cc -c -o /dev/tty jar.1.c
 ```
 

1989/jar.2/README.md

@@ -1,13 +1,13 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
 
 ## To use:
 
-```<!---sh-->
+``` <!---sh-->
     ./jar.2
     [enter some lisp]
 
@@ -19,7 +19,7 @@ NOTE: this entry will likely segfault on invalid input.
 
 ## Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./try.sh
 
     ./try.sh chocolate_cake.lisp
@@ -65,7 +65,7 @@ lisp expressions (followed by CR), the program evaluates them and
 prints out the return values. End execution by typing an end-of-file
 character.
 
-```<!---lisp-->
+``` <!---lisp-->
     (+ 2.5 3.1)
     (defun fib (n)
        (if (< n 2)

1989/ovdluhe/README.md

@@ -1,6 +1,6 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
@@ -11,7 +11,7 @@ To get this to compile with a modern CPP, we had to replace `#D` with `#define`.
 
 Run the program this way:
 
-```<!---sh-->
+``` <!---sh-->
     ./ovdluhe < textfile
 ```
 
@@ -21,7 +21,7 @@ by chance or is killed.
 
 ## Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./try.sh ; sleep 2 ; ./try.sh
 ```
 
@@ -34,7 +34,7 @@ it's a `#define` it's easy to set up.
 
 ### Alternate build:
 
-```<!---sh-->
+``` <!---sh-->
     make P=9 clobber alt
 ```
 
@@ -46,14 +46,14 @@ program to fail and a negative value will cause a compilation error.
 
 ### Alternate use:
 
-```<!---sh-->
+``` <!---sh-->
     ./ovdluhe.alt
 ```
 
 
 ### Alternate try:
 
-```<!---sh-->
+``` <!---sh-->
     ./try.alt.sh
 
     P=5 ./try.alt.sh

1989/paul/README.md

@@ -1,6 +1,6 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
@@ -10,7 +10,7 @@ out. See [alternate code](#alternate-code) below for more details.
 
 ## Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./paul
 ```
 
@@ -28,14 +28,14 @@ could easily be added.
 
 ### Alternate build:
 
-```<!---sh-->
+``` <!---sh-->
     make alt
 ```
 
 
 ### Alternate use:
 
-```<!---sh-->
+``` <!---sh-->
     ./paul.alt
 ```
 

1989/robison/README.md

@@ -1,6 +1,6 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
@@ -18,7 +18,7 @@ For more detailed information see [1989 robison bugs](../../bugs.html#1989_robis
 
 ## To use:
 
-```<!---sh-->
+``` <!---sh-->
     ./robison
     # enter valid expressions
 ```
@@ -26,7 +26,7 @@ For more detailed information see [1989 robison bugs](../../bugs.html#1989_robis
 
 ## Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./robison
     11x10
     # enter other expressions

1989/roemer/README.md

@@ -1,13 +1,13 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
 
 ## Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./roemer
 ```
 

1989/tromp/README.md

@@ -1,20 +1,20 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
 
 ## To use:
 
-```<!---sh-->
+``` <!---sh-->
     ./tromp [drops_per_sec  [cmd_string]]
 ```
 
 
 ## Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./tromp 5
 
     ./tromp 10 "hkl jq"
@@ -53,7 +53,7 @@ the judges' additional remarks in the author's remarks, for more details.
 
 ### Alternate build:
 
-```<!---sh-->
+``` <!---sh-->
     make alt
 ```
 
@@ -138,7 +138,7 @@ at the start and `-raw` at the end. This further reduces the size of
 the program, but has the possible disadvantage that the program
 can only by stopped by 'q' or by the `kill -9' command.
 
-```<!---c-->
+``` <!---c-->
     long h[4];t(){h[3]-=h[3]/3000;setitimer(0,h,0);}c,d,l,v[]={(int)t,0,2},w,s,I,K
     =0,i=276,j,k,q[276],Q[276],*n=q,*m,x=17,f[]={7,-13,-12,1,8,-11,-12,-1,9,-1,1,
     12,3,-13,-12,-1,12,-1,11,1,15,-1,13,1,18,-1,1,2,0,-12,-1,11,1,-12,1,13,10,-12,

1989/vanb/README.md

@@ -1,13 +1,13 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
 
 ## Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./try.sh
 ```
 

1989/westley/README.md

@@ -1,6 +1,6 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
@@ -20,26 +20,26 @@ For more detailed information see [1989 westley bugs](../../bugs.html#1989_westl
 
 Try compiling and running the 4 resulting programs like:
 
-```<!---sh-->
+``` <!---sh-->
     ./compile.sh
 ```
 
 If you need to specify an alternate compiler path, say because your default
 compiler is clang (or in the case of macOS gcc is clang) you can do so like:
 
-```<!---sh-->
+``` <!---sh-->
     CC=/opt/local/bin/gcc-mp-12 ./compile.sh
 ```
 
 If you wish to delay the script or remove the delay you can do so like:
 
-```<!---sh-->
+``` <!---sh-->
     DELAY=2 ./compile.sh
 ```
 
 Finally try:
 
-```<!---sh-->
+``` <!---sh-->
     ./westley
     # input some lines of text, sending EOF (usually ctrl-d) to end
 
@@ -70,7 +70,7 @@ different algorithm for each version (hereafter referred to as
 When compiling these versions, one needs to define `trgpune`
 in the compile line (which the Makefile now has).  Example:
 
-```<!---sh-->
+``` <!---sh-->
     cc -Dtrgpune=putchar ver3.c -o ver3
 ```
 
@@ -109,13 +109,13 @@ function `vs()` to define in the ROT13 version.  But a function
 called `vs()` turns into a function called `if()` in the original,
 so it can't be done.  Therefore, I do:
 
-```<!---c-->
+``` <!---c-->
     expr1 && expr2 && (expr3=etc);
 ```
 
 which is the same as:
 
-```<!---c-->
+``` <!---c-->
     if (expr1 && expr2) expr3=etc;
 ```
 
@@ -124,7 +124,7 @@ expressions if they aren't in an assignment or conditional
 statement.  This might warrant a warning, since other compilers
 may do this.  I found MANY compilers botched:
 
-```<!---c-->
+``` <!---c-->
     expr1 && (expr2,expr3);
 ```
 
@@ -146,7 +146,7 @@ such statements to make it more portable.
 
 Normally (!), a reversible C program is done thus:
 
-```<!---c-->
+``` <!---c-->
     /**/ forward code /*/ edoc drawkcab /**/
 ```
 
@@ -154,7 +154,7 @@ If your compiler nests comments, it will get this wrong.
 However, I have made some bits of the code palindromic,
 (or different, but reversible) so it is more like:
 
-```<!---c-->
+``` <!---c-->
     /**/forward/*//**/ palindromic /**//*/drawkcab/**/
 ```