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.

1985/shapiro/README.md

@@ -14,6 +14,7 @@ There is alternate code which allows one to change the size of the maze. See
 ./shapiro
 ```
 
+
 ## Alternate code:
 
 The code has a define `C` set to 39 but this can be modified to change the size
@@ -22,11 +23,11 @@ of the maze. The alt code allows one to easily do this.
 
 ### Alternate build:
 
-
 ```sh
 make alt
 ```
 
+
 ### Alternate try:
 
 If you wish to change the value you can do it like: