DOC: Make doc examples using StringIO python2-3 compatible #10996
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On python 3
StringIOcan only be imported fromio, but thenio.StringIOneeds unicode input on python 2. The python 2-3 polyglot solution is to import fromioand use u-strings in the examples, see also #10991.I was also going to update the outputs in the docstrings, but then I ran into #10990.
Fixes #10511.