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Most changes to Pythonrequire a NEWS entry.

Please add it using theblurb_it web app or theblurb command-line tool.

@bedevere-bot tq done

Thank you for the contributed PR! The copyright changes were made and backported in another PR (#100848). However, that PR did miss one spot in README.rst that your PR found. That change was made from your PR into#100863 and backported.

For future reference, when making PRs, it is best to create a new local branch and pushing that rather than using yourmain branch. Since we always use git squash merges, the commit id of the final change will not match that in your local repo and you would need to do a merge when doing agit pull to update your local copy ofmain (if there are no other changes you need to save on your localmain branch, you could usegit reset --hard to purge your change and reset to an older commit and thengit pull upstream.