[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 fbf8e823c02ac1c93a48609cc74e439e19ccb426 by Terry Jan Reedy in branch '3.6':
 [3.6] bpo-32614: Modify re examples to use a raw string to prevent wa…  …rning (GH-5265) (GH-5500)
https://github.com/python/cpython/commit/fbf8e823c02ac1c93a48609cc74e439e19ccb426


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