R1:52fb3eb5f403

Fix command typo in managing_daemons.diviner

Summary:
Fix the 'managing daemons' doc's example for launching daemons in a
way suitable for multiple web servers. Separate the '--no-discovery'
argument with '--', otherwise it doesn't appear to be understood.

Test Plan:
Attempt to launch daemon in various ways, make sure to include
ways that are expected to fail, otherwise it may not be doing what
we expect.

phd launch PhabricatorRepositoryPullLocalDaemon --no-discovery
.. errors in daemon log…