Docs: Update read-only replica GRANTs (#4509)
Docs: Update read-only replica GRANTs (#4509)

Generated using the approach documented at the end of the page:
https://treeherder.readthedocs.io/admin.html#direct-database-access

Follow-up to #3613 and #4015.
edmorley/treeherder,edmorley/treeherder,edmorley/treeherder,KWierso/treeherder,edmorley/treeherder,KWierso/treeherder,KWierso/treeherder,KWierso/treeherder