Merge topic 'CheckLanguage-doc-cuda-host'

be03265fa0 Help: Explicitly note that projects should not set CMAKE_CUDA_HOST_COMPILER
13d78bbf16 CheckLanguage: Document that CMAKE_CUDA_HOST_COMPILER should not be set alone
cfd92dece3 CheckLanguage: Modernize documentation formatting

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !8670