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.

1995/cdua/README.md

@@ -79,7 +79,7 @@ make all
 
 ### Original use:
 
-```
+```sh
 ./cdua
 ```