[3.13] gh-140806: add docs for `enum.bin` function (#140807) (#143740)

(cherry picked from commit 7f50a5febd7af7259237a78dc533e9f9f274d51c)

Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>