Clarify if py_wheel only supports pure Python wheels

According to https://github.com/bazel-contrib/rules_python/blob/a4b946bbe1b3e83ca4602a0d059fea823b0ded65/python/packaging.bzl#L102, py_wheel only supports pure python wheels.

However, looking around it seems to me that this comment is outdated, so I thought I'd ask if this is still up to date.

Thank you!

Read python/packaging.bzl around line 102 and trace the current py_wheel behavior to determine whether the pure-Python limitation is still accurate. Done means the supported wheel types are clearly documented there, with the comment corrected if the investigation shows it is outdated.

Written by the indexing model from the issue text.