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.

2011/konno/README.md

@@ -52,7 +52,7 @@ This program ignores non-lower case letters.
 
 ### Obfuscation
 
-* `for` is not used.\
+* `for` is not used.
 * A part of the program is encrypted.