[docs] [issue21279] str.translate documentation incomplete

[Terry J. Reedy]

Terry J. Reedy added the comment:

Many people may not know that IndexError and KeyError are subclasses of LookupError. I have not decided what to add yet, but I think we are close.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21279>
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