Fixed typo in docs/topics/db/managers.txt
Fixed flake8 warnings.
Added ordering to fix non-deterministic relatedapp test.
Fixed #23567 -- Made assertQuerysetEqual check Counter equality when ordered=False
Fixed spelling mistakes and added words to wordlist.
Fixed #17638 -- Added crosslinks between topic and reference guides.

Thanks oinopion for the suggestion and jarus for the initial patch.
Fixed #23489 -- Added numpy 1.9+ support in template lookups
Fixed #23365 -- Added support for timezone-aware datetimes to migrations.
Fixed #16731 -- Made pattern lookups work properly with F() expressions