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

Change by miss-islington mariatta.wijaya+miss-islington@gmail.com:

---------- nosy: +miss-islington nosy_count: 8.0 -> 9.0 pull_requests: +24100 pull_request: https://github.com/python/cpython/pull/25366

_______________________________________ Python tracker report@bugs.python.org https://bugs.python.org/issue41661 _______________________________________