R1:9ec6677c0271

Update "bin/drydock command" help text to use more standard quoting

Summary: Ref T13676. Modern conventions quote flags in help text.

Test Plan: Read text.

Subscribers: PHID-OPKG-gm6ozazyms6q6i22gyam

Maniphest Tasks: T13676

Differential Revision: https://secure.phabricator.com/D21797