typo fix

docs/mainpage.dox

@@ -74,7 +74,7 @@ appropriate functions in memory.c
 @page DiscussionForum ENet Discussion Forum
 
 The <a href="http://jbserver.com/forums/ForumHome.asp?ForumId=6">
-ENet discussion forum</a> provides a convenient place ask for help,
+ENet discussion forum</a> provides a convenient place to ask for help,
 share code and ideas, or report bugs.
 
 */