[clang-tidy][NFC] Remove reference to Visual studio native plugin

The clang-tidy documentation contained:

> MS Visual Studio has a native clang-tidy-vs plugin

This plugin was removed via 559ae14c.

Fixes: https://github.com/llvm/llvm-project/issues/62142

Reviewed By: PiotrZSL

Differential Revision: https://reviews.llvm.org/D148354