wording improvement by the Wanderer

Originally committed as revision 12427 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/issue_tracker.txt

@@ -149,7 +149,7 @@ bug/closed/wont_fix
     Bugs which we will not fix. Possible reasons include legality, high
     complexity for the sake of supporting obscure corner cases, speed loss
     for similarly esoteric purposes, et cetera.
-    This also means that wont_fix means we would reject a patch.
+    This also means that we would reject a patch.
     If we are just too lazy to fix a bug then the correct state is open
     and unassigned. Closed means that the case is closed which is not
     the case if we are just waiting for a patch.