Docs and comments fixes from James H.

[originally from svn r8866]

puzzles.but

@@ -2843,10 +2843,7 @@ These parameters are available from the \q{Custom...} option on the
 
 \dt \e{Width}, \e{Height}
 
-\dd Size of grid in squares. There will be half \e{Width} \by \e{Height}
-dominoes in the grid: if this number is odd then one square will be blank.
-
-(Grids with at least one odd dimension tend to be easier to solve.)
+\dd Size of grid in squares.
 
 \dt \e{Force start/end to corners}
 

signpost.c

@@ -1,9 +1,5 @@
 /*
  * signpost.c: implementation of the janko game 'arrow path'
- *
- * Remaining troublesome games:
- *
- * 4x4#438520052525454
  */
 
 #include <stdio.h>