[bug#73055] [PATCH] doc: Explain `git format-patch` revision format

[Ekaitz Zarraga <ekaitz@elenq.tech>]

* doc/contributing.texi(Sending a Patch Series): Add a note about
`git format-patch` revision format and link to git documentation.

Change-Id: Ie08f85dc19e3804165fb184664b74e85a804d7c4
---
 doc/contributing.texi | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/doc/contributing.texi b/doc/contributing.texi
index 73f7addbef..d5d63ebdbd 100644
--- a/doc/contributing.texi
+++ b/doc/contributing.texi
@@ -2187,6 +2187,18 @@ Sending a Patch Series
       --cover-letter --base=auto
 @end example
 
+@quotation Note
+@code{git format-patch} accepts a wide range of
+@uref{https://git-scm.com/docs/gitrevisions, revision range} specifiers.
+For example, if you are working in a branch, you could select all commits
+in your branch starting at @code{master}.
+
+@example
+$ git format-patch master..@var{MY_BRANCH} -o outgoing \
+      --cover-letter --base=auto
+@end example
+@end quotation
+
 We can now send @emph{just} the cover letter to the
 @email{guix-patches@@gnu.org} address, which will create an issue
 that we can send the rest of the patches to.

base-commit: 7d2ced8d6d9c38327592d312376d59a8c37fc160
-- 
2.45.2