[clang-tools-extra] [clang-tidy][NFC] Remove guidelines in documentation of misc-multiple-inheritance (PR #186657)

[Zeyi Xu via cfe-commits]

zeyi2 wrote:

I'd like to merge this first, if we come up with a different approach later, we can revert this or apply a new patch.

https://github.com/llvm/llvm-project/pull/186657