Remove stale TODO about masking :help version8

We already fixed the masking in previous commit. The TODO is now
invalid.

Author: ychin

src/version.c

@@ -3935,7 +3935,6 @@ intro_message(
 	N_("type  :help<Enter>  or  <F1>  for on-line help"),
 	N_("type  :help version9<Enter>   for version info"),
 #ifdef FEAT_GUI_MACVIM
-        // TODO: Don't steal the show from version8 help?
 	N_("type  :help macvim<Enter>     for MacVim help "),
 #endif
 	NULL,