release-22.2.1: fix a release note

https://github.com/cockroachdb/cockroach/pull/92880 fixed a bug but had an incorrect release note. In particular, it said that the bug was introduced in 22.1.0:
```
Release note (bug fix): CockroachDB previously could incorrectly
evaluate queries that performed left semi and left anti "virtual lookup"
joins on tables in pg_catalog or information_schema. These join types
can be planned when a subquery is used inside of a filter condition. The
bug was introduced in 22.1.0 and is now fixed.
```
but it was actually introduced in 20.2.0. The PR will be included into 22.2.1 release, so the release note should be adjusted.