[llvm] [LLVM][DOCS] Add documentation for 'host' and 'Native' options in LLVM_TARGETS_TO_BUILD. (PR #111382)

[Harrison Hao via llvm-commits]

harrisonGPU wrote:

Hello, @nikic , I have already updated it, please take a look agagin. :)

https://github.com/llvm/llvm-project/pull/111382