[docs] [issue32614] Fix documentation examples of using re with escape sequences

[Terry J. Reedy]

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


New changeset 66771422d0541289d0b1287bc3c28e8b5609f6b4 by Terry Jan Reedy (Cheryl Sabella) in branch 'master':
bpo-32614: Modify re examples to use a raw string to prevent warning (GH-5265)
https://github.com/python/cpython/commit/66771422d0541289d0b1287bc3c28e8b5609f6b4


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