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.

2005/sykes/README.md

@@ -307,7 +307,7 @@ What does this do?
 ```sh
 ./sykes pet.rom -1
 ```
-\
+
 Have fun!