[PATCH] Documentation: Mention '--subject-prefix' in git-send-email's manual

[PATCH] Documentation: Mention '--subject-prefix' in git-send-email's manual

[Sergio Durigan Junior]

This commit adds a mention to the '--subject-prefix' option in
git-send-email's documentation.  This option is already described in
git-format-patch's docs (because it belongs to this command, actually),
but it is very useful when you are submitting patches using
git-send-email too, for obvious reasons.

The text describing the option has been adapted from git-format-patch,
in order to be "self-contained" and not mention other options that are
not present in git-send-email's docs (e.g., '--numbered').

Signed-off-by: Sergio Durigan Junior <sergiodj@sergiodj.net>
---
 Documentation/git-send-email.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/git-send-email.txt b/Documentation/git-send-email.txt
index a60776e..76f531a 100644
--- a/Documentation/git-send-email.txt
+++ b/Documentation/git-send-email.txt
@@ -110,6 +110,13 @@ is not set, this will be prompted for.
 	Only necessary if --compose is also set.  If --compose
 	is not set, this will be prompted for.
 
+--subject-prefix=<Subject-Prefix>::
+	Instead of the standard '[PATCH]' prefix in the subject
+	line, instead use '[<Subject-Prefix>]'. This is useful if you
+	are sending an RFC instead of a patch, or if the patch version
+	has been bumped (e.g., '[PATCH v2]').  See also
+	linkgit:git-format-patch[1].
+
 --to=<address>::
 	Specify the primary recipient of the emails generated. Generally, this
 	will be the upstream maintainer of the project involved. Default is the
-- 
1.9.0