Add release notes for Django Evolution 2.2.

Review Request #12389 — Created June 20, 2022 and submitted — Latest diff uploaded

Information

Django Evolution
release-2.x

Reviewers

This is a pretty big release under the hood, mostly centered around code
cleanup, Django 3.2/4.0 compatibility, and with a lot of fixes to index
management (mostly to faciliate the Index class).

As the vast majority of the work is internal, and some was for the
il-fated Custom Migrations support, those have been left out of the
release notes.

Built the docs. Checked for spelling, build, and link errors.

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