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.

2005/boutines/README.md

@@ -20,7 +20,6 @@ ruby -e '20.times{puts "#{rand} #{rand}"}' | ./boutines > test.svg
 
 ### Try:
 
-
 ```sh
 ./boutines < input.txt > result.svg
 ```