For some reason these were missed.

This looks way better than the first attempt:

 - both full and incremental upgrades are added for the existing v2
   boilerplate UDFs, regarding past versions: 4.0, 4.1, 4.1.1, and 4.2;

 - add boilerplate plus full/incremental upgrades for non-existing v2
   UDFs, regarding past versions: 4.0~beta1, 4.0~beta2, and 4.0~rc1;

 - add boilerplate UDFs for this release and the next two ones
   (emergency release and release candidate): 4.2.1, 4.2.2, 4.5~rc1;

 - minor edits (extra quotes around the version) for the existing v2
   boilerplate UDFs, regarding next versions: 4.3, 4.5 (presumably to
   avoid integer/string confusion).

This reverts commit 77fc5d4e.

The release process documentation being followed was buggy, let's start
over.