Fix bogus link in test comments.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: f7a1a805cb178653ea2a6c8991ad73b035af953e
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2021-01-07T03:09:16Z
Releases: 14.0
Fix bogus link in test comments.

I apparently copied-and-pasted the wrong link in commit ca8217c10.
Point it where it was meant to go.

Files