Fix typo in doc

Author: andymass

doc/matchup.txt

@@ -500,8 +500,8 @@ Note: this feature is only available if your vim version has |timers| and
 the function |timer_pause|, version 7.4.2180 and after.  For neovim, this
 will only work in nvim-0.2.1 and after.
 
-*g:matchparen_matchparen_deferred_show_time*
-*g:matchparen_matchparen_deferred_hide_time*
+*g:matchup_matchparen_deferred_show_time*
+*g:matchup_matchparen_deferred_hide_time*
 
   Adjust timeouts in milliseconds for deferred highlighting.