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.

1988/applin/README.md

@@ -1,6 +1,6 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
@@ -12,7 +12,7 @@ program.  See the [Alternate code](#alternate-code) section below for details.
 
 ## Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./applin
 ```
 
@@ -25,7 +25,7 @@ with this entry.
 
 ### Alternate build:
 
-```<!---sh-->
+``` <!---sh-->
     make alt
 ```
 

1988/dale/README.md

@@ -1,6 +1,6 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
@@ -18,13 +18,13 @@ For more detailed information see [1988 dale bugs](../../bugs.html#1988_dale).
 
 ## Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./try.sh
 ```
 
 Observe that three of the commands in the script are:
 
-```<!---sh-->
+``` <!---sh-->
     ./dale these files are in this directory: *
     ./dale $(printf "the following files exist in this directory:\n%s\n" *)
     ./dale "$(printf "the following files exist in this directory:\n%s\n" *)"

1988/isaak/README.md

@@ -1,6 +1,6 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
@@ -11,7 +11,7 @@ code](#alternate-code) below.
 
 ## To use:
 
-```<!---sh-->
+``` <!---sh-->
     ./isaak
 ```
 
@@ -21,7 +21,7 @@ code](#alternate-code) below.
 The original version of this code is in [isaak.alt.c](isaak.alt.c).
 The original entry starts with the line:
 
-```<!---c-->
+``` <!---c-->
     main(){};
 ```
 
@@ -37,7 +37,7 @@ compile.
 
 ### Alternate build:
 
-```<!---sh-->
+``` <!---sh-->
     make alt
 ```
 
@@ -64,7 +64,7 @@ due to the fact that BSD style systems have an `sprintf(3)` that returns a `char
 *`.  Due to the above problems, we placed the output of this program in the
 file: isaak.encode.  To read this file do.
 
-```<!---sh-->
+``` <!---sh-->
     uudecode < isaak.encode
     cat isaak.output
 ```

1988/litmaath/README.md

@@ -1,13 +1,13 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make
 ```
 
 
 ## To use:
 
-```<!---sh-->
+``` <!---sh-->
     ./litmaath some text
 ```
 
@@ -17,7 +17,7 @@ code](#alternate-code) section below.
 
 ## Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./litmaath eschew obfuscation
 ```
 
@@ -31,7 +31,7 @@ a file.
 
 ### Alternate build:
 
-```<!---sh-->
+``` <!---sh-->
     make alt
 ```
 
@@ -40,7 +40,7 @@ Use `litmaath.alt` as you would `litmaath` above.
 
 ### Alternate try:
 
-```<!---sh-->
+``` <!---sh-->
     ./litmaath.alt six was afraid of seven because seven eight nine
 ```
 
@@ -50,7 +50,7 @@ Use `litmaath.alt` as you would `litmaath` above.
 Note the unusual structure:
 
 
-```<!---c-->
+``` <!---c-->
     while (<condition>)
 	     ;
 ```
@@ -66,7 +66,7 @@ could make the body of the `while` loop an `fprintf` with interesting
 variables like:
 
 
-```<!---c-->
+``` <!---c-->
     fprintf(stderr,
 	 "argv=%lo *argv=%lo **argv=%c argv[1]=%lo *argv[1]=%c argc=%d\n",
 	 (long) argv, (long) *argv, *argv && **argv ? **argv : '@',

1988/phillipps/README.md

@@ -1,6 +1,6 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 

1988/reddy/README.md

@@ -1,13 +1,13 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
 
 ## Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./reddy
     char *(*(fun[16])();
     char *(*(*(*(*(*fun[32])))))();
@@ -15,7 +15,7 @@
 
 What happens if you input, and what you do about it?
 
-```<!---c-->
+``` <!---c-->
     char *(*(*(*(*(*fun[32])))))());
 ```
 

1988/robison/README.md

@@ -1,20 +1,20 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
 
 ## Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./robison 80 10
     ./robison 40 16
 ```
 
 The first and second parameters are optional.  You might also try:
 
-```<!---sh-->
+``` <!---sh-->
     ./robison 80 2   # <--- can you find the bug?
     ./robison 80 -246
 ```
@@ -24,7 +24,7 @@ The first and second parameters are optional.  You might also try:
 
 The following might make an interesting benchmark:
 
-```<!---sh-->
+``` <!---sh-->
     ./robison 100
 ```
 

1988/spinellis/README.md

@@ -1,6 +1,6 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make clobber all
 ```
 
@@ -12,7 +12,7 @@ code](#alternate-code) section below.
 
 ## To use:
 
-```<!---sh-->
+``` <!---sh-->
     ./spinellis
 ```
 
@@ -21,7 +21,7 @@ EOF (typically ctrl-d).
 
 Now run again:
 
-```<!---sh-->
+``` <!---sh-->
     ./spinellis
 ```
 
@@ -33,7 +33,7 @@ For clang or compilers that won't read from `/dev/tty`, we provide this version.
 
 ### Alternate build:
 
-```<!---sh-->
+``` <!---sh-->
     make clobber alt
 ```
 
@@ -42,7 +42,7 @@ and follow the instructions.
 
 ### Alternate use:
 
-```<!---sh-->
+``` <!---sh-->
     ./spinellis.alt
 ```
 
@@ -51,7 +51,7 @@ EOF (typically ctrl-d).
 
 Now run again:
 
-```<!---sh-->
+``` <!---sh-->
     ./spinellis.alt
 ```
 

1988/westley/README.md

@@ -1,6 +1,6 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
@@ -11,13 +11,13 @@ might wish to do so.
 
 ## Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./westley
 ```
 
 Also try:
 
-```<!---sh-->
+``` <!---sh-->
     ./try.sh
 ```
 
@@ -31,7 +31,7 @@ This version is the original which might not work as you expect nowadays.
 
 ### Alternate build:
 
-```<!---sh-->
+``` <!---sh-->
     make alt
 ```
 
@@ -41,7 +41,7 @@ This version is the original which might not work as you expect nowadays.
 To see if your compiler has the problem described in the Judges' remarks below,
 try:
 
-```<!---sh-->
+``` <!---sh-->
     ./westley.alt
 ```
 
@@ -52,7 +52,7 @@ Does it show the same output as `westley`?
 
 Your compiler must parse
 
-```<!---c-->
+``` <!---c-->
     #define _ -a
     -_
 ```
@@ -62,7 +62,7 @@ conforming ANSI C Preprocessors may object to this: for such
 compilers, you can elide the non-standard token-pasting requirement
 by changing the #define line to:
 
-```<!---c-->
+``` <!---c-->
     #define _ F-->00||F-OO--;
 ```
 
@@ -71,7 +71,7 @@ code is the original.
 
 You might enjoy looking at the output of:
 
-```<!---sh-->
+``` <!---sh-->
     cc -E westley.alt.c
 ```