[docs] [issue32800] Replace deprecated link to new page on w3c site

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:


New changeset e6033209754c5b01870791645044a791da1fa73f by Terry Jan Reedy (Miss Islington (bot)) in branch '3.7':
bpo-32800: Update link to w3c doc for xml default namespaces (GH-5609) (GH-5611)
https://github.com/python/cpython/commit/e6033209754c5b01870791645044a791da1fa73f


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