[docs] Create documentation for [MDL-73284] (4.5 dev update)

[aspark21]

What is the Moodle feature that needs documenting?

Started testing Moodle 4.5 and came across this error h5p/moodle-mod_hvp#562 and lsuonline/lsuce-block_quickmail#90 which I traced back to https://tracker.moodle.org/browse/MDL-73284

but no mention in https://moodledev.io/docs/4.5/devupdate about what to do.

These deprecations haven't been throwing any warnings in out phpunit or behat tests until now, so these fatal exceptions will be the first time plugin developers will encounter these, would be helpful if this was documented in dev update for 4.5

Is this documentation specific to a Moodle version?

Yes

Are you able to provide a patch for this?

No (Default)