[docs] [issue11476] StreamHandler code broken by change of parameter name

[follower]

follower <bugs.python.org at rancidbacon.com> added the comment:

I don't think it would be unreasonable to add the old name back in temporarily and use whichever parameter is supplied--this change has obviously broken code in the process.

But for future situations I think changes like this shouldn't happen
without a deprecation process.

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<http://bugs.python.org/issue11476>
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