Audit all docstrings for style, typos and outdated info

[systemcatch]

Pull Request Checklist

Thank you for taking the time to improve Arrow! Before submitting your pull request, please check all appropriate boxes:

• [ ] 🧪 Added tests for changed code.
• [ ] 🛠️ All tests pass when run locally (run tox or make test to find out!).
• [ ] 🧹 All linting checks pass when run locally (run tox -e lint or make lint to find out!).
• [ ] 📚 Updated documentation for changed code.
• [ ] ⏩ Code is up-to-date with the master branch.

If you have any questions about your code changes or any of the points above, please submit your questions along with the pull request and we will try our best to help!

Description of Changes

Closes: https://github.com/arrow-py/arrow/issues/819 Closes: #946

[codecov[bot]]

Codecov Report

Merging #939 (996d047) into master (57c67d0) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #939   +/-   ##
=======================================
  Coverage   99.74%   99.74%           
=======================================
  Files          10       10           
  Lines        1944     1944           
  Branches      312      312           
=======================================
  Hits         1939     1939           
  Misses          4        4           
  Partials        1        1           

Impacted Files	Coverage Δ
arrow/arrow.py	98.99% <ø> (ø)
arrow/constants.py	100.00% <ø> (ø)
arrow/factory.py	100.00% <ø> (ø)
arrow/formatter.py	100.00% <ø> (ø)
arrow/locales.py	100.00% <ø> (ø)
arrow/parser.py	100.00% <ø> (ø)
arrow/util.py	100.00% <ø> (ø)

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[jadchaar]

Is this ready for review @systemcatch?

[systemcatch]

Ready for a first review!