Fix tmp/format-headers.sh, format headers

The script had "s surrounding the git ls-files command which turned it
to a single file which of course is wrong.

Ran script again fixing many README.md files that had incorrect number
of blank lines for critical headers.

This will have to be done a final but a good number of files have been
corrected.

2013/cable2/README.md

@@ -16,8 +16,6 @@ STATUS: INABIAF - please **DO NOT** fix
 For more detailed information see [2013 cable2 in bugs.md](/bugs.md#2013-cable2).
 
 
-
-
 ## To use:
 
 ```sh