Fix comment search highlight + multi-word search

[shamoon]

Proposed change

Fixes the issue with searching for multi-word comments and fixes some issues that can with comment search highlighting.

Comment searching has proved to be a bit more complicated than I realized, honestly mostly because I find the whoosh docs to be opaque, but thats on me. The fix here is mostly to let whoosh handle the highlighting on its own instead of trying to mess with it. I also took the opportunity to allow for visual highlighting more than one comment. See screenshots of all

Fixes #2536

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (please explain)

Checklist:

• I have read & agree with the contributing guidelines.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• If applicable, I have checked that all tests pass, see documentation.
• I have run all pre-commit hooks, see documentation.
• I have made corresponding changes to the documentation as needed.
• I have checked my modifications for any breaking changes.

[coveralls]

Pull Request Test Coverage Report for Build 4027216755

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 10 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.01%) to 92.737%

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Files with Coverage Reduction	New Missed Lines	%
documents/views.py	10	95.3%

Totals
Change from base Build 4026976752:	0.01%
Covered Lines:	5554
Relevant Lines:	5989

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💛 - Coveralls

[stumpylog]

I also find Whoosh to be difficcult reading.

[github-actions]

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