[docs] [issue16209] add a "class str" entry to the docs

[Nick Coghlan]

Nick Coghlan added the comment:

The simpler approach Chris has taken here (i.e. just leaving the string methods separate from the class definition) also works.

Patch looks good to me - I'm definitely in favour of moving towards a more consistent approach of having the builtin function definitions reference to full class definitions (as shown by the changes I made to the docs for the other sequence types).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16209>
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