Remove python bin declaration in switcher script am: e1ceb9a9c5 am: 9e6196c3be am: 236e06cf92 am: 9f63465f10 am: 3cdd669c1b

Original change: https://android-review.googlesource.com/c/platform/tools/doc_generation/+/1825736

Change-Id: Ibb6318b8772579365ee79170f9c1ca106870c6d2