Help: Fix typo in CMAKE_VS_PLATFORM_TOOLSET_HOST_ARCHITECTURE

Help/variable/CMAKE_VS_PLATFORM_TOOLSET_HOST_ARCHITECTURE.rst

@@ -4,7 +4,7 @@ CMAKE_VS_PLATFORM_TOOLSET_HOST_ARCHITECTURE
 Visual Studio preferred tool architecture.
 
 The :ref:`Visual Studio Generators` for VS 2013 and above support optional
-selection of a 64-bit toolchain on 64-bit hosts by specifying a ``host=64``
+selection of a 64-bit toolchain on 64-bit hosts by specifying a ``host=x64``
 value in the :variable:`CMAKE_GENERATOR_TOOLSET` option.  CMake provides
 the selected toolchain architecture preference in this variable (either
 ``x64`` or empty).