DOC CountVectorizer: Add note on List[int] memory usage for #13062 #31627
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This PR adds a note to
CountVectorizerhighlighting that for small documents, usingList[int]internally can lead to better memory efficiency compared toarray.array('i'). This observation was based on a benchmark run during the investigation of #13062.No code changes are introduced — documentation only.
Fixes #13062