phabricator: update the protocol documentation...
phabricator: update the protocol documentation
The `branch` property wasn't added to the `hg:meta` example when it was added to
the metadata in d49ab47be8a6. Additionally, `properties` in the Differential
Revision dict is a dinctionary, not a list. While here, also alphabetize the
responses from Phabricator because that's how it is being printed with
`hg debugcallconduit`, and this makes it easier to compare.
Differential Revision:
https://phab.mercurial-scm.org/D8170
