Update documentation to reflect the correct format of user_id (fully qualified).

This will be used to retry outbound transactions to a remote server if
we think it might have come back up.

Generally try to make this more comprehensible, and make it match the
conventions.

I've removed the documentation for all the settings which allow you to change
the names of the template files, because I can't really see why they are
useful.

Signed-off-by: Manuel Stahl <manuel.stahl@awesome-technologies.de>

Co-Authored-By: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>

Have a purge job running every 5min is probably not something we want to advise admins to do as a sort-of default.

This looks like it got half-killed back in #888.

Fixes #6567.

put the 2nd part of the "source installation"-section into a new section, because it also applies to Debian packages

* Remove sections of federate.md explaining delegation at time of Synapse 1.0 transition

Signed-off-by: Aaron Raimist <aaron@raim.ist>

* Add changelog

Signed-off-by: Aaron Raimist <aaron@raim.ist>

TODO: automate generation of this

I want to do some key rotation, and it is silly that we don't have a way to do
this.

Ensure that the the default settings for the room directory are that the it is hidden from public view by default. 

Cf #6422

since I found myself wonder how it works

The expected use case is to suppress MAU limiting on small instances

Add a linting script that enforces all boolean values in the default config be lowercase.

This has annoyed me for a while so I decided to fix it.