Documentation: Add note on sending files directly with Mutt

Like 'git send-email', Mutt can also be used to send patches generated
with 'git format-patch'. This works regardless of the editor the
contributor has set up to use with Mutt.

Signed-off-by: Eddie Kovsky <ewk@edkovsky.org>
Reviewed-by: Darren Hart <dvhart@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/email-clients.txt b/Documentation/email-clients.txt
index 3fa4508..3c2f7ac 100644
--- a/Documentation/email-clients.txt
+++ b/Documentation/email-clients.txt
@@ -176,6 +176,10 @@
 if you want to include the patch inline.
 (a)ttach works fine without "set paste".
 
+You can also generate patches with 'git format-patch' and then use Mutt
+to send them:
+    $ mutt -H 0001-some-bug-fix.patch
+
 Config options:
 It should work with default settings.
 However, it's a good idea to set the "send_charset" to: