* Add information on MSC3758: event_property_is.
* Add information on MSC3966: event_property_contains.
* Add information on MSC3873 dotted-path escape rules.
* Newsfragment
* Update sync filter with ref to appendix.
* Escape example key.
* Fix typos.
Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>
* Fix links.
* Clarify the appendix a bit.
* Clarify support values.
* Add MSC3980 to changelog.
---------
Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>