Add documentation to the `S1XX` rules (#5479)
## Summary
Add documentation to the `S1XX` rules (the `flake8-bandit` ['misc
tests'](https://bandit.readthedocs.io/en/latest/plugins/index.html#plugin-id-groupings)
rule group).
## Test Plan
`python scripts/check_docs_formatted.py && mkdocs serve`
