doc: show usage of branch description
The branch description will be included in 'git format-patch --cover-letter' and in 'git pull-request' emails. It can also be used in the automatic merge message. Tell the reader. While here, clarify that the description may be a multi-line explanation of the purpose of the branch's patch series. Signed-off-by: NPhilip Oakley <philipoakley@iee.org> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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