Fix docs source link for importlib.metadata

[flying-sheep]

The link broke for Python 3.10 since importlib.metadata was made from a module into a package

I think this is trivial enough to not need a bpo issue.

Automerge-Triggered-By: GH:jaraco

[FFY00]

Ugh, docs are a bit of a pain to keep in sync 😅

[FFY00]

@jaraco, remember to change the target branch to main and add the backport label 😁

[jaraco]

We'll want to apply this change to the cpython branch of importlib_metadata also. Otherwise, it might get overwritten during the next update from there.

[FFY00]

The importlib_metadata does not contain this link, it is part of the CPython only header.

[jaraco]

I applied the change at python/importlib_metadata@90083722648.

[jaraco]

@jaraco, remember to change the target branch to main and add the backport label 😁

Good catch. I not only had to change the target branch, but I had to cherry-pick and force-push the change against main (because CPython doesn't use the SCM to maintain ancestry of changes).

[miss-islington]

@flying-sheep: Status check is done, and it's a success ✅ .

[miss-islington]

Thanks @flying-sheep for the PR 🌮🎉.. I'm working now to backport this PR to: 3.10.
🐍🍒⛏🤖

[bedevere-bot]

GH-29330 is a backport of this pull request to the 3.10 branch.