bpo-23706: Add newline parameter to pathlib.Path.write_text (GH-22420) (GH-22420)



* Add _newline_ parameter to `pathlib.Path.write_text()`
* Update documentation of `pathlib.Path.write_text()`
* Add test case for `pathlib.Path.write_text()` calls with _newline_ parameter passed

Automerge-Triggered-By: GH:methane
4 files changed