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.

1984/anonymous/README.md

@@ -14,7 +14,7 @@ make all
 ./anonymous
 ```
 
-### Alternate code:
+## Alternate code:
 
 The original version of this entry was added, by request,
 in order to show the code that was turned into the