[3.9] bpo-43620: Remove reference to os.sep from os.path.join() doc (GH-25025)

[miss-islington]

• removed ambiguous reference to os.sep from os.path.join() doc
  (cherry picked from commit 21a2cab)

Co-authored-by: Jared Sutton jpsutton@gmail.com

https://bugs.python.org/issue43620

[the-knights-who-say-ni]

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[miss-islington]

@jpsutton and @freddrake: Status check is done, and it's a success ✅ .

[miss-islington]

@jpsutton and @freddrake: Status check is done, and it's a success ✅ .

[miss-islington]

@jpsutton and @freddrake: Status check is done, and it's a success ✅ .

[miss-islington]

@jpsutton and @freddrake: Status check is done, and it's a success ✅ .

[bedevere-bot]

@freddrake: Please replace # with GH- in the commit message next time. Thanks!