Added/fixed some documentation reported by winapi_check.

diff --git a/controls/desktop.c b/controls/desktop.c
index 1341ff3..809e78d 100644
--- a/controls/desktop.c
+++ b/controls/desktop.c
@@ -228,7 +228,7 @@
 
 
 /***********************************************************************
- *           SetDeskWallPaper32   (USER32.475)
+ *           SetDeskWallPaper   (USER32.475)
  *
  * FIXME: is there a unicode version?
  */