[docs] [issue15555] Default newlines of io.TextIOWrapper

[R. David Murray]

R. David Murray added the comment:

And that is the value of os.linesep at Python startup.  I'm don't think that we really support the mutability of os.linesep, we just don't bother to make it immutable.  I'm not sure how this would be documented, since code that does use "os.linesep" is indeed affected by changing it.

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nosy: +r.david.murray

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