Changing heading level of 'Alternate code'

Change level 3 (###) to level 2 (##):

    sgit -e 's/^### \(Alternate code\)/## \1/g' '*README.md'

which is the same as:

    sgit -e 's/^### Alternate code/## Alternate code/g' '*README.md'

This is per discussion in GitHub.

2001/dgbeards/README.md

@@ -18,7 +18,7 @@ make
 ```
 
 
-### Alternate code:
+## Alternate code:
 
 The author provided a way to speed it up a bit and also how to make it so it
 doesn't crash on losing.  The idea that it crashes on losing was too good to

2001/herrmann2/README.md

@@ -73,7 +73,7 @@ diff herrmann2.alt.c herrmann2.orig.c && echo "output matches with original code
 ```
 
 
-### Alternate code:
+## Alternate code:
 
 If you wish to use the original version that does not work for all platforms,
 you can make use of the [herrmann2.alt.c](herrmann2.alt.c) by running:

2001/kev/README.md

@@ -42,7 +42,7 @@ paddle. See below Alternate code.
 ```
 
 
-### Alternate code:
+## Alternate code:
 
 To use:
 

2001/westley/README.md

@@ -26,7 +26,7 @@ make
 ```
 
 
-### Alternate code:
+## Alternate code:
 
 An alternate version of this entry, [westley.alt.c](westley.alt.c), is provided.
 This alternate code might be less portable.