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.

2005/mynx/README.md

@@ -33,7 +33,7 @@ Some have pointed out that this will not work for https initially
 for two reasons. For a starting point see the alternate code section below.
 
 
-### Alternate code:
+## Alternate code:
 
 As noted this will not work for https. This is because it does not scan for
 https but also a secure connection needs to be set up before http commands can

2005/vince/README.md

@@ -29,7 +29,7 @@ another) while the X11 server is running.
 echo "Do or do not. There is no try."
 ```
 
-### Alternate code:
+## Alternate code:
 
 The [vince.alt.c](vince.alt.c) code of the submission will run on SGI IRIX and
 also has the recursive CPP macro (which sneaked in accidentally) removed.