[docs] [issue21545] Tutorial: examples and comment about mutation methods

[Terry J. Reedy]

Terry J. Reedy added the comment:

Thanks David. If this is not to be your last contribution, and we hope not, please fill out the contributor agreement, if you have hot already, at
https://www.python.org/psf/contrib/contrib-form/

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resolution:  -> fixed
stage: needs patch -> resolved
status: open -> closed

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<http://bugs.python.org/issue21545>
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