Fix while_loop hint, update pragma hint in visitor.py

[micpap25]

Summary of changes

Fixes a mistake introduced by #346, which claims that visitor:_visit_while_loop is affected by self._check_only.
Additionally, updates the docstring of visitor:_visit_pragma to match the rest of the file.

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[TheGupta2012]

This should be left as is, see the other methods

[TheGupta2012]

Added one comment, but should be okay to merge

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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