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.

1993/ejb/README.md

@@ -48,7 +48,7 @@ We note that this also works under macOS just fine.
 #### Output solution to Towers of Hanoi for five rings:
 
 ```sh
-./ejb 5\
+./ejb 5
 ```
 
 The format of the output for the Towers of Hanoi case is simply a
@@ -57,7 +57,7 @@ text description of how to solve the puzzle.
 #### Output solution to the Patience puzzle for six rings:
 
 ```sh
-./ejb -6\
+./ejb -6
 ```