* Improve deprecations (#72697)
* Remove space before comma in '... bla , use ...'
* 'why' is inserted in the middle of a sentence, between two commas.
* Make deprecations from base.yml show source ansible-core.
* Add changelog fragment.
* Improve some more 'why's.
* Add PR URL to fragment.
(cherry picked from commit f569d80fde)
* 2.10 is ansible-base, not ansible-core
