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.

1985/applin/README.md

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

1985/august/README.md

@@ -1,20 +1,20 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
 
 ## To use:
 
-```<!---sh-->
+``` <!---sh-->
     ./august
 ```
 
 
 ## Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./try.sh
 ```
 
@@ -22,7 +22,7 @@ If you have the `primes(6)` tool (sometimes part of [BSD
 Games](https://github.com/vattam/BSDGames)) you can see
 what of the output in the first `N` (say `15` or `25`) lines are primes:
 
-```<!---sh-->
+``` <!---sh-->
     ./primes.sh # 15
     ./primes.sh 25
 ```

1985/lycklama/README.md

@@ -1,13 +1,13 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make alt
 ```
 
 
 ## To use:
 
-```<!---sh-->
+``` <!---sh-->
     ./lycklama.alt < some_file
 ```
 
@@ -24,13 +24,13 @@ call with a configurable time to sleep. The default is 500 microseconds but you
 reconfigure it like:
 
 
-```<!---sh-->
+``` <!---sh-->
     make SLEEP=700 clobber alt
 ```
 
 which would set it at 700. Then, whether you use the default value or not, try:
 
-```<!---sh-->
+``` <!---sh-->
     ./try.alt.sh
 ```
 
@@ -45,21 +45,21 @@ modern systems.
 
 ### Original build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
 
 ### Original use:
 
-```<!---sh-->
+``` <!---sh-->
     ./lycklama < some_file
 ```
 
 
 ### Original try:
 
-```<!---sh-->
+``` <!---sh-->
     ./lycklama < lycklama.c
     ./lycklama < lycklama.alt.c
     ./lycklama < lycklama.orig.c

1985/shapiro/README.md

@@ -1,6 +1,6 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
@@ -10,7 +10,7 @@ There is alternate code which allows one to change the size of the maze. See
 
 ### To run:
 
-```<!---sh-->
+``` <!---sh-->
     ./shapiro
 ```
 
@@ -23,7 +23,7 @@ of the maze. The alt code allows one to easily do this.
 
 ### Alternate build:
 
-```<!---sh-->
+``` <!---sh-->
     make alt
 ```
 
@@ -32,7 +32,7 @@ of the maze. The alt code allows one to easily do this.
 
 If you wish to change the value you can do it like:
 
-```<!---sh-->
+``` <!---sh-->
     make clobber SIZE=5 alt
 ```
 
@@ -41,7 +41,7 @@ error. If it's <= 0 || >= 5000 then it is set to 39, the default.
 
 You might also wish to try:
 
-```<!---sh-->
+``` <!---sh-->
     ./try.alt.sh
 ```
 

1985/sicherman/README.md

@@ -1,6 +1,6 @@
 ## To build:
 
-```<!---sh-->
+``` <!---sh-->
     make all
 ```
 
@@ -11,7 +11,7 @@ more details on it.
 
 ## To use:
 
-```<!---sh-->
+``` <!---sh-->
     ./sicherman < file
 
     echo foo | ./sicherman
@@ -23,7 +23,7 @@ more details on it.
 
 ## Try:
 
-```<!---sh-->
+``` <!---sh-->
     ./try.sh
 ```
 
@@ -43,7 +43,7 @@ audience.
 Although this will be built if the original fails to compile you can do it
 manually like:
 
-```<!---sh-->
+``` <!---sh-->
     make alt
 ```
 
@@ -52,14 +52,14 @@ In this case it will be built as `sicherman.alt`.
 
 ### Alternate use:
 
-```<!---sh-->
+``` <!---sh-->
     ./sicherman.alt < file
 ```
 
 
 ### Alternate try:
 
-```<!---sh-->
+``` <!---sh-->
     ./try.alt.sh
 ```
 
@@ -80,7 +80,7 @@ on a line.  Now enter the letters 'n' through 'z'.  But to borrow a quote
 from Richard Stallman: If you think you understand what this code
 does, then you don't, so read it again!  Explain why:
 
-```<!---sh-->
+``` <!---sh-->
     ./sicherman < sicherman.c | ./sicherman | diff - ./sicherman.c
 ```