docs: Fix a few typos

[timgates42]

There are small typos in:

• cacheops/query.py
• cacheops/utils.py
• tests/tests.py
• tests/utils.py

Fixes:

• Should read superclasses rather than superclassses.
• Should read querying rather than quering.
• Should read overridden rather than overriden.
• Should read omitting rather than omiting.
• Should read differently rather than diffrently.
• Should read different rather than diffrent.
• Should read destroy rather than destory.

Semi-automated pull request generated by https://github.com/timgates42/meticulous/blob/master/docs/NOTE.md

[Suor]

Thanks, merged