[xen staging] doc: Add git commands to generate Fixes

[patchbot@xxxxxxx]

commit 8a5116371da0505c9b716a9ad5df8a3b8b4c5ae4
Author:     Bertrand Marquis <bertrand.marquis@xxxxxxx>
AuthorDate: Wed Aug 3 15:43:04 2022 +0100
Commit:     Julien Grall <jgrall@xxxxxxxxxx>
CommitDate: Thu Aug 4 17:48:01 2022 +0100

    doc: Add git commands to generate Fixes
    
    Add git commands examples that can be used to generate fixes and how to
    use the pretty configuration for git.
    This should make it easier for contributors to have the right format.
    
    Signed-off-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
    Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
    Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 docs/process/sending-patches.pandoc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/docs/process/sending-patches.pandoc 
b/docs/process/sending-patches.pandoc
index 7ff7826c99..2e74c3b57e 100644
--- a/docs/process/sending-patches.pandoc
+++ b/docs/process/sending-patches.pandoc
@@ -102,6 +102,10 @@ E.g.:
 
     Fixes: 67d01cdb5518 ("x86: infrastructure to allow converting certain 
indirect calls to direct ones")
 
+If git was configured as explained earlier, this can be retrieved using
+``git log --pretty=fixes`` otherwise ``git log --abbrev=12 --oneline`` will
+give the proper tag and commit-id.
+
 ### Backport:
 
 A backport tag is an optional tag in the commit message to request a
--
generated by git-patchbot for /home/xen/git/xen.git#staging