Merge pull request #16618 from mppf/update-prereqs-python-3
Update prereqs.rst for python 3
Follow-up to PR #16560
- Update prereqs.rst to describe Python 3 requirements
- While there, I noticed a
makethat should be
doc/Makefile, so fix that too
I tested the updated suggested package-install commands (see PR #16619).
I removed the OpenSUSE section because I was unable to test with a recent
Reviewed by @lydia-duncan - thanks!