doc: note how to install git send-email

* doc/contributing.texi (git send-email): Add install instructions.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>
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Arne Babenhauserheide 2019-07-12 23:43:33 +02:00 committed by Ludovic Courtès
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@ -982,5 +982,6 @@ first send one message to @email{guix-patches@@gnu.org}, and then send
subsequent patches to @email{@var{NNN}@@debbugs.gnu.org} to make sure
they are kept together. See
@uref{https://debbugs.gnu.org/Advanced.html, the Debbugs documentation}
for more information.
for more information. You can install @command{git send-email} with
@command{guix install git:send-email}.
@c Debbugs bug: https://debbugs.gnu.org/db/15/15361.html