Copyedits to PEP 679

[JelleZijlstra]

No description provided.

[hugovk]

Plus a few others suggestions:

Line 45:

-Although is possible to currently format long ``assert`` statements over
+Although it is possible to currently format long ``assert`` statements over

Line 56:

-the authors of this document believe the parenthesized form is more clear and more consistent with
+the authors of this document believe the parenthesized form is clearer and more consistent with

Also there's a move to discourage references and link directly instead: #2130

So update line 67:

This change has been originally discussed and proposed in [bpo-46167]_.

And line 153 (plus "exist" -> "exists"):

A proposed draft PR with the change exist in [GH-30247]_.

[pablogsal]

Thanks a lot for the edits @JelleZijlstra 🎉

[JelleZijlstra]

Thanks Pablo! Hugo's other suggestions in the message above are still open but I think better handled in a new PR.