Help: Reference CMAKE_CUDA_COMPILER_ID not CMAKE_CUDA_COMPILER

We should refer to the compiler ID in the documentation to avoid users checking
compiler executable names, since that seems fragile.

Help/variable/CMAKE_CUDA_HOST_COMPILER.rst

@@ -3,9 +3,9 @@ CMAKE_CUDA_HOST_COMPILER
 
 .. versionadded:: 3.10
 
-When :variable:`CMAKE_CUDA_COMPILER <CMAKE_<LANG>_COMPILER>` is set to
-NVIDIA ``nvcc``, ``CMAKE_CUDA_HOST_COMPILER`` selects the compiler
-executable to use when compiling host code for ``CUDA`` language files.
+When :variable:`CMAKE_CUDA_COMPILER_ID <CMAKE_<LANG>_COMPILER_ID>` is
+``NVIDIA``, ``CMAKE_CUDA_HOST_COMPILER`` selects the compiler executable to use
+when compiling host code for ``CUDA`` language files.
 This maps to the ``nvcc -ccbin`` option.
 
 The ``CMAKE_CUDA_HOST_COMPILER`` variable may be set explicitly before CUDA is
@@ -20,6 +20,6 @@ is read-only and changes to it are undefined behavior.
 .. note::
 
   Since ``CMAKE_CUDA_HOST_COMPILER`` is meaningful only when the
-  ``CMAKE_CUDA_COMPILER`` is ``nvcc``, it does not make sense to
-  set ``CMAKE_CUDA_HOST_COMPILER`` explicitly without also setting
-  ``CMAKE_CUDA_COMPILER`` explicitly to be sure it is ``nvcc``.
+  :variable:`CMAKE_CUDA_COMPILER_ID <CMAKE_<LANG>_COMPILER_ID>` is ``NVIDIA``,
+  it does not make sense to set ``CMAKE_CUDA_HOST_COMPILER`` without also
+  setting ``CMAKE_CUDA_COMPILER`` to NVCC.