Merge pull request #9873 from Carreau/no-universal-wheels

Warn about universal wheels in the docs.

docs/source/coredev/release_process.rst

@@ -176,8 +176,10 b' Run the ``release`` script, this step requires having a current wheel, Python'
     ./tools/release
 
 This makes the tarballs, zipfiles, and wheels, and put them under the ``dist/``
-folder. Be sure to test the ``wheel`` and the ``sdist`` locally before uploading
-them to PyPI.
+folder. Be sure to test the ``wheels``  and the ``sdist`` locally before
+uploading them to PyPI. We do not use an universal wheel as each wheel
+installs an ``ipython2`` or ``ipython3`` script, depending on the version of
+Python it is built for. Using an universal wheel would prevent this.
 
 Use the following to actually upload the result of the build::