[1.7.x] Fixed #23288: deconstruct() ignoring related_name
[1.7.x] Complemented 1.6 release notes for 457c16d0d6

And accessorily added missing bits fixing #23293.
[1.7.x] Fixed typo in docs/howto/custom-model-fields.txt.

Backport of 99561eef26 from master
[1.7.x] Fixed typo in tests/migrations/test_operations.py

Backport of 0ad4672c0f from master
[1.7.x] Fixed #23278 -- Documented django.db.backends.schema logger

Backport of ef90d395ab from master
[1.7.x] Fixed #23294 -- Add related_name to existing migrations.

Thanks to Florian Apolloner for the review; refs #23288.

Backport of 1d79d08d9a from master
[1.7.x] Fixed #23296 -- Fixed RunPython code sample in Migration Operations.

Backport of 7ca665c5f5 from master
[1.7.x] Fixed syntax highlighting and indentation in docs/topics/logging.txt.

Backport of 90b64db39c from master