qapi: Document optional arguments' backwards compatibility
Signed-off-by: NEric Blake <eblake@redhat.com> Signed-off-by: NFam Zheng <famz@redhat.com> Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com>
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Signed-off-by: NEric Blake <eblake@redhat.com> Signed-off-by: NFam Zheng <famz@redhat.com> Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com>