Update documentation style & fix room version heading order #3683
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Also add a missing signing key section to v6.
This additionally contains various edits to the fragments to have them make a little bit more sense in context.
Finally, this updates various aspects of the documentation style which haven't previously been considered - they're added here considering we're in the area.
Fixes #3564
Fixes #3656
Preview: https://pr3683--matrix-org-previews.netlify.app