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.

1994/tvr/README.md

@@ -35,9 +35,11 @@ Mode may be a value from 0 to 12.
 
 The author has provided us a spoiler version:
 
-	make tvr.alt
-	./tvr.alt altmode screensize/2 < colormapfile
-\
+```sh
+make tvr.alt
+./tvr.alt altmode screensize/2 < colormapfile
+```
+
 where `altmode` `1` - `4` correspond to mode `0` - `3` in the original entry and
 `altmode 0` calculates Mandelbrot/Julian sets correctly.