[issue12296] Minor clarification in devguide

[Terry J. Reedy]

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

The parenthetical comment is a complete sentence, and no longer trivial. I would separate it and write it more simply as
"... their code. (This obviously does not apply to new classes, functions, or optional arguments.)"

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nosy: +terry.reedy

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<http://bugs.python.org/issue12296>
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