Update the static documentation about event subscription to include the new
/events API, and to add more details about how queries work. Mention that the
streaming API is deprecated.
Remove JSON-RPC wrappers from GET output, since they are no longer printed.
Also format examples with jq so they look a little neater.
Fixes#7779.
Co-authored-by: William Banfield <4561443+williambanfield@users.noreply.github.com>
