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However, looking around it seems to me that this comment is outdated, so I thought I'd ask if this is still up to date.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the supported wheel types are clearly documented there, with the comment corrected if the investigation shows it is outdated.

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