Update room IDs and alias with ones on the Matrix Specification

[luixxiul]

Related: https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/3631

This PR intends to update room IDs and alias with ones on the Matrix Specification.

See:

• https://spec.matrix.org/v1.12/#room-structure where the room ID !qporfwt:matrix.org is used as an example.
• https://spec.matrix.org/v1.12/#room-aliases where the room ID !aaabaa:matrix.org is used as an example.
• https://spec.matrix.org/v1.12/#room-aliases where the room alias #matrix:example.org is used as an example.

If I am honest, I do not think those are nice choices... they should be something which looks more as example, but using ones on the specs should help us to keep consistency when they are updated on a future spec version.

[spantaleev]

I'm also a bit worried that using something like !qporfwt:example.com may be less visible (and easier to miss when adjusting configs) than !your-room-id:your-server.com.

It's probably fine though.

[luixxiul]

I guess something such as !example:example.com, !example:example.net, and #example:example.org could be better, though there are too much "example" here..

I'll open an issue to track the issue.