Provide an LDAPS example in LDAP auth

Summary: Fixes T4148. LDAPS works with "ldaps://", it just isn't documented or clear.

Test Plan: {F84893}

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4148

Differential Revision: https://secure.phabricator.com/D7652