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Commit 6a8c0b5102 "qapi: Add feature flags to struct types" neglected to document how to document feature flags. Make up for that. Cc: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20211026111023.76937-3-armbru@redhat.com> [Editing accident fixed]