Improved federation configuration docs.  Specifically detailing  .well-known and SRV based delegation methods. 

Inspiration Valentin Lab <valentin.lab@kalysto.org> for https://github.com/matrix-org/synapse/pull/4781

Inserts a zero-width space in the `-->` which isn't supposed to close a
comment. This used to be here but it got lost in
d8682627.

* Fix check-newsfragment script

I previously broke this so that it always succeeded...

* more fixes

* fix newsfiles

So that it actually works. See https://httpd.apache.org/docs/2.4/mod/mod_proxy.html#proxypass



Signed-off-by: Paul Tötterman <paul.totterman@iki.fi>

 Prevent showing non-fed rooms in fed /publicRooms v2

Revert "Prevent showing non-fed rooms in fed /publicRooms"

Config option to prevent showing non-fed rooms in fed /publicRooms

* Don't log stack trace when client has gone away during media download

* Newsfile

* Fixup newsfile

Fixes #4675.

* add trivial clarification about jemalloc

* switch from google.com to recaptcha.net

because https://developers.google.com/recaptcha/docs/faq#can-i-use-recaptcha-globally

Log tracebacks correctly

Fix backfill storing incorrect state for events

MSC 1866 - Use M_UNSUPPORTED_ROOM_VERSION for invite API

Handle errors when fetching remote server keys