Documentation/SubmittingPatches: Fix typo in GMail section

Commit e498257d introduced a typo while improving the GMail section
of SubmittingPatches.

Signed-off-by: Tim Henigan <tim.henigan@gmail.com>
Acked-by: Michael J Gruber <git@drmicha.warpmail.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/SubmittingPatches

@@ -520,7 +520,7 @@ Gmail
 
 GMail does not appear to have any way to turn off line wrapping in the web
 interface, so this will mangle any emails that you send.  You can however
-use "git send e-mail" and send your patches through the GMail SMTP server, or
+use "git send-email" and send your patches through the GMail SMTP server, or
 use any IMAP email client to connect to the google IMAP server and forward
 the emails through that.