trunk/6cd007b2b622a6fc2b5d3b8c6f6a659e3e8b019c: Revert "[docs] Clarify compile backward autocast default (#184839)"

«This reverts commit 04035e1. Reverted #184839 on behalf of https://github.com/pytorch-auto-revert due to Reverted automatically by pytorch's autorevert, to avoid this behaviour add the tag autorevert: disable (comment)»