Document that we should also offer sha256 checksums for packages
Fixed #22918 -- Fixed SeparateDatabaseAndState crash
Revert "Undocumented SeparateDatabaseAndState so crash is not RB. Refs #22918"

This reverts commit a8521a2c228bd9e981dc8a2bea4e26f4544a52a7.
Added missing import in docs/ref/signals.txt.
Fixed comments in en_GB and en_AU formats.py files.

Changed comments in en_GB and en_AU formats files replacing 'pm' with
'p.m.' to match what is actually output.
Merge pull request #3120 from alex/use-sha256

Document that we should also offer sha256 checksums for packages
Cleanup run on the 1.7 release notes.
Fixed #23400 -- Added "Remove 'south' from INSTALLED_APPS" to upgrade instructions.

Thanks dgrant for the report.
Fixed #23302 -- Added --name/-n option to makemigrations command
Added dates to release notes.
Added stub release notes for 1.7.1.