Reporting was already disabled in Bug 1443605.
This keeps the `enabled` getter as a way to detect if it is enabled, in use in BrowserUITelemetry only.
This keeps `addEvent` and related methods, as they are still in use on Android.
Sphinx has been complaining about a number of reStructuredText warnings
for a while. Fix all the ones in .rst files.
Not asking for review because this is docs only and changing .rst files
can't break anything important.
DONTBUILD (NPOTB)
