[3.13] gh-114990: Add missing mixin methods in collections.abc's document (GH-114991) #128535
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(cherry picked from commit 5768fef)
Co-authored-by: AN Long [email protected]
Co-authored-by: Carol Willing [email protected]
collections.abcare not mentioned in the Document #114990📚 Documentation preview 📚: https://cpython-previews--128535.org.readthedocs.build/