[docs] [issue41661] os.path.relpath does not document ValueError on Windows with different drives

Change by Zackery Spytz zspytz@gmail.com:

---------- keywords: +patch nosy: +ZackerySpytz nosy_count: 7.0 -> 8.0 pull_requests: +24080 stage: -> patch review pull_request: https://github.com/python/cpython/pull/25346

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