[docs] [issue34319] Clarify pathlib.Path("filepath").read_text()

[Terry J. Reedy]

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

How about if we add "The file is opened and then closed." before "The optional parameters have the same meaning as in open()."

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nosy: +terry.reedy
stage:  -> needs patch
versions: +Python 3.6, Python 3.7, Python 3.8

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