[issue43927] Remove IOError references from the tutorial

[Terry J. Reedy]

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

IOError is a back-compatibility synonym for OSError.  I will eliminate the last use from all 3 versions.  The change to the previous example was done by 2 people who did not backport to 3.9 and I will not bother with that.  Future versions are already fixed.

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stage: patch review -> 
versions: +Python 3.11

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<https://bugs.python.org/issue43927>
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