[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 8d1f2f40389c476d9240ec87a33da0373597c6af by Terry Jan Reedy (sblondon) in branch 'master':
bpo-32800: Update link to w3c doc for xml default namespaces (GH-5609)
https://github.com/python/cpython/commit/8d1f2f40389c476d9240ec87a33da0373597c6af


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