Documentation/merge subtree How-To: fix typo

Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Documentation/howto/using-merge-subtree.txt

@@ -71,5 +71,5 @@ Additional tips
   relevant parts of your tree.
 
 - Please note that if the other project merges from you, then it will
-  connects its history to yours, which can be something they don't want
+  connect its history to yours, which can be something they don't want
   to.