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.

1994/dodsond1/README.md

@@ -11,7 +11,8 @@ make all
 ./dodsond1
 ```
 
-## Try:
+
+### Try:
 
 At the prompt, try entering `E3`.
 

1994/dodsond2/README.md

@@ -27,6 +27,7 @@ For more detailed information see [1994 dodsond2 in bugs.md](/bugs.md#1994-dodso
 ./dodsond2
 ```
 
+
 ## Alternate code:
 
 This version allows you to choose how many arrows to start with, instead of the
@@ -35,8 +36,8 @@ default 0. If one tried specifying a value < 0 it will set it to 0.
 Fun fact: this version helped uncover and fix a bug that prevented the entry
 from working on some cases.
 
-### Alternate build:
 
+### Alternate build:
 
 ```sh
 make alt

1994/horton/README.md

@@ -14,10 +14,8 @@ make all
 `A`, `B`, `C` and `D` are numeric arguments.
 
 
-
 ### Try:
 
-
 ```sh
 ./horton 3 2 1 0
 ```
@@ -28,6 +26,7 @@ Also try:
 ./gtface  < gtface.data
 ```
 
+
 ## Alternate code:
 
 This confuses cb greatly. See [horton.alt.c](horton.alt.c) for an unobfuscated/enhanced
@@ -36,7 +35,6 @@ version.
 
 ### Alternate build:
 
-
 ```sh
 make alt
 ```
@@ -44,7 +42,6 @@ make alt
 
 ### Alternate use:
 
-
 ```sh
 ./horton.alt A B C D
 ```

1994/weisberg/README.md

@@ -55,7 +55,6 @@ it was read on `stdin` instead of via `cc -E`.
 
 ## Author's remarks:
 
-
 ### Description
 
 The following short program implements the "Yet Another" algorithm for