doc/rados: improve troubleshooting-mon.rst

doc/rados: improve troubleshooting-mon.rst

Don't ceph tell mon_status and then claim it passes the help command.
Improve language and link to cephadm doc on asok usage. Add label and
note about accessing asok from the host in troubleshooting.rst.
Capitalize and use double backticks consistently.
Add some missing articles and other minor word changes.
Fix indentation.
Use ref and link definitions consistently, use automatic bold.
Use privileged prompts for CLI commands where necessary.
Remove spaces at end of lines and change tabs to four spaces.

Signed-off-by: Ville Ojamo <git2233+ceph@ojamo.eu>