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.

1996/schweikh3/README.md

@@ -46,9 +46,9 @@ and thanks for the virtual memories!  :-)
 NOTE: On some systems such as SunOS, one may need to compile with:
 
 ```make
-	    ${CC} ${CFLAGS} \
-	      -I. -D_POSIX_SOURCE '-Ddifftime(a,b)=(double)(b-a)' \
-	      schweikh3.c -o schweikh3
+	${CC} ${CFLAGS} \
+	  -I. -D_POSIX_SOURCE '-Ddifftime(a,b)=(double)(b-a)' \
+	  schweikh3.c -o schweikh3
 ```