Update client_server.rst
(`#751 <https://github.com/matrix-org/matrix-doc/pull/751>`_).
- Add key distribution APIs, for use with end-to-end encryption.
(`#894 <https://github.com/matrix-org/matrix-doc/pull/894>`_).
+ - Add ``m.room.pinned_events`` state event for rooms.
+ (`#1007 <https://github.com/matrix-org/matrix-doc/pull/1007>`_).
- Spec clarifications:
