Fix spelling errors in code comments

Reported-by: Jens Schleusener <Jens.Schleusener@fossies.org>
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/git-send-email.perl b/git-send-email.perl
index 5f92c89..dc95656 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -1228,7 +1228,7 @@
 # domain name that corresponds the IP address in the HELO/EHLO
 # handshake. This is used to verify the connection and prevent
 # spammers from trying to hide their identity. If the DNS and IP don't
-# match, the receiveing MTA may deny the connection.
+# match, the receiving MTA may deny the connection.
 #
 # Here is a deny example of Net::SMTP with the default "localhost.localdomain"
 #