update help text to align with v6 CLI.
update help text to align with v6 CLI.

- change aligned with a9d3916ca920fd26835bacc97767b2cc7f30969f

[#151841382]

Signed-off-by: Anand Gaitonde <4f0ff06b2390eeadb0769d298cbdb3dc6df4c73d@pivotal.io>

cloudfoundry/cli,cloudfoundry/cli,cloudfoundry/cli