cleanup winner README.md files

Fixed cases where there was a bad trailing backslash.

Improved a few cases where a code block was needed
to highlight some text.

Changed a few cases where a code block needed to
declared as, say, a sh code block.

Fixed a few cases where the winner information was not properly formatted.

Plus a few nits and clarifying text was added.

1996/schweikh2/README.md

@@ -48,7 +48,6 @@ The author also suggests:
 
 ```sh
 while :; do grep -v '#' schweikh2.c; done
-
 ```
 
 (and we do too) which works with `sh`, `bash`, `ksh` and `zsh` as well.
@@ -143,12 +142,12 @@ minutes (`gcc -O3`).
 ### Sample arguments:
 
 ```sh
-$ ./schweikh2 6
-$ ./schweikh2 7 0
-$ ./schweikh2 7 7 0\
-$ ./schweikh2 8 9 -1 -67/21
-$ ./schweikh2 8 2 2/5 -98/25
-$ ./schweikh2 2 1/0 1 1/0
+./schweikh2 6
+./schweikh2 7 0
+./schweikh2 7 7 0
+./schweikh2 8 9 -1 -67/21
+./schweikh2 8 2 2/5 -98/25
+./schweikh2 2 1/0 1 1/0
 ```
 
 ### Miscellaneous
@@ -157,7 +156,7 @@ The diamond pattern can be continued without a break.\
 For a nice printout try this on your Bourne compatible shell:
 
 ```sh
-% while :; do grep -v '#' schweikh2.c; done
+while :; do grep -v '#' schweikh2.c; done
 ```