Replace some http://www.php.net URIs with https://www.php.net
Summary: Faster, happier, more productive.
Test Plan: Click 'em all.
Reviewers: O1 Blessed Committers, Cigaryno, valerio.bozzolan
Reviewed By: O1 Blessed Committers, Cigaryno, valerio.bozzolan
Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno
Differential Revision: https://we.phorge.it/D25896