Rebrand: Add "path" entries to PlatformSymbols

Summary: Ref T15006. Change a few places that were mentioning phabricator path.

Test Plan: Mk1 eyeball on each effected page.

Reviewers: O1 Blessed Committers, valerio.bozzolan

Reviewed By: O1 Blessed Committers, valerio.bozzolan

Subscribers: speck, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T15006

Differential Revision: https://we.phorge.it/D25343