Diviner: Fix an internal 404 link
Summary:
rP85083c88 renamed/changed some links. This one did not get updated / was missed.
Refs T15015
Test Plan:
* Go to http://phorge.localhost/book/phorge/article/events/
* Under "Next Steps", click the last link "building a library with..."
* Apply this patch
* Run `./bin/diviner generate`
* Repeat steps 1 and 2
Reviewers: O1 Blessed Committers, mainframe98
Reviewed By: O1 Blessed Committers, mainframe98
Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno
Maniphest Tasks: T15015
Differential Revision: https://we.phorge.it/D26249