Document that preprocessing.strip_punctuation
is limited to ASCII punctuation characters
#2964
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This PR mitigates issue #2962 by documenting that the function's current behavior is limited to ASCII punctuation.
Issue #2962 includes discussion of approaches to expanding strip_punctuation's behavior to cover unicode punctuation. This PR includes no new functionality / does not implement any of the possibilities considered in the issue. This PR is option 1 of the 3 considered in #2962