Docs and help out of date for commands in this repo

[MichaelGoberling]

Example: aio plugins update

Expected Behaviour

README matches source code in terms of description and available flags.

Update all installed plugins.
This command will only:
- update user-installed plugins that are not core

USAGE
  $ aio plugins update [-h] [-i] [-l] [-c] [-v]

FLAGS
  -h, --help     Show CLI help.
  -v, --verbose
  -i --interactive ...
  -l --list ...
  -c --confirm ...

DESCRIPTION
Update all installed plugins.
This command will only:
- update user-installed plugins that are not core

Actual Behaviour

Only a short description and a small subset of flags are shown:

Update installed plugins.

USAGE
  $ aio plugins update [-h] [-v]

FLAGS
  -h, --help     Show CLI help.
  -v, --verbose

DESCRIPTION
  Update installed plugins.

[aiojbot]

JIRA issue created: https://jira.corp.adobe.com/browse/ACNA-2291