Fix doc link to Restarting Phorge

Summary: See Q81. Link to /diviner/find/ could not find the documentation because it was renamed to "Restarting Phorge".

Test Plan:

1. Uninstall optional PHP extension zip and restart Phorge
2. Vist /config/issue/ and click on a missing extension issue
3. Click on the documentation link to Restarting

Reviewers: O1 Blessed Committers, valerio.bozzolan, speck

Reviewed By: O1 Blessed Committers, valerio.bozzolan, speck

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

Differential Revision: https://we.phorge.it/D25459