More runtime cli docs (#793)
More runtime cli docs (#793)

* Add runtime_CLI docs on table_add and a few other commands

* Small markup changes and mark all undocumented commands with TODO

* Add IETF IPv6 address format for 128-bit values, and fix markup

p4lang/behavioral-model,p4lang/behavioral-model,p4lang/behavioral-model,p4lang/behavioral-model,p4lang/behavioral-model