Documentation required for Pulsar Proxy and TLS changes

[jai1]

Need to add documentation for the flags added during Pulsar Proxy changes and TLS changes:-

#1225
#1208
#1169
#1168
#1002

[sijie]

@jai1 are you working on this?

[ivankelly]

Broke this down into more digestible issues:

#1225 -> #2402
#1208 -> #2403
#1169 -> #2404
#1168 -> Already there in http://pulsar.apache.org/docs/en/security-authorization/#proxy-roles
#1002 -> #2405