[1.6.x] Fixed #23097 -- Switched to new octal format in docs

Backport of e1c85167a3 from master.
[1.6.x] Fixed #22305 -- Added note to docs about UTF8 database requirement.

Backport of 08b85de9b7 from master
[1.6.x] Fixed #22553 -- Added refreshing queryset info to docs.

Backport of 6d5daa30cf from master
[1.6.x] Fixed #23106 -- Updated class-based view reference title.

Backport of f14898a453 from master