paragraph grouper type hint

[Coniferish]

Fix type hint for paragraph_grouper param. paragraph_grouper can be set to False, but the type hint did not not reflect this previously.

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: unstructured/partition/text.py

Function	Unhandled Issue
_partition_text	UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 0: invalid start byte ... Event Count: 1

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[scanny]

LGTM :)