Help: Clarify that `cmake -A` option sets VS IDE target architecture

Help/generator/Visual Studio 10 2010.rst

@@ -4,7 +4,7 @@ Visual Studio 10 2010
 Generates Visual Studio 10 (VS 2010) project files.
 
 The :variable:`CMAKE_GENERATOR_PLATFORM` variable may be set
-to specify a target platform name.
+to specify a target platform name (architecture).
 
 For compatibility with CMake versions prior to 3.1, one may specify
 a target platform name optionally at the end of this generator name:

Help/generator/Visual Studio 11 2012.rst

@@ -4,7 +4,7 @@ Visual Studio 11 2012
 Generates Visual Studio 11 (VS 2012) project files.
 
 The :variable:`CMAKE_GENERATOR_PLATFORM` variable may be set
-to specify a target platform name.
+to specify a target platform name (architecture).
 
 For compatibility with CMake versions prior to 3.1, one may specify
 a target platform name optionally at the end of this generator name:

Help/generator/Visual Studio 12 2013.rst

@@ -4,7 +4,7 @@ Visual Studio 12 2013
 Generates Visual Studio 12 (VS 2013) project files.
 
 The :variable:`CMAKE_GENERATOR_PLATFORM` variable may be set
-to specify a target platform name.
+to specify a target platform name (architecture).
 
 For compatibility with CMake versions prior to 3.1, one may specify
 a target platform name optionally at the end of this generator name:

Help/generator/Visual Studio 14 2015.rst

@@ -4,7 +4,7 @@ Visual Studio 14 2015
 Generates Visual Studio 14 (VS 2015) project files.
 
 The :variable:`CMAKE_GENERATOR_PLATFORM` variable may be set
-to specify a target platform name.
+to specify a target platform name (architecture).
 
 For compatibility with CMake versions prior to 3.1, one may specify
 a target platform name optionally at the end of this generator name:

Help/generator/Visual Studio 15.rst

@@ -4,7 +4,7 @@ Visual Studio 15
 Generates Visual Studio 15 project files.
 
 The :variable:`CMAKE_GENERATOR_PLATFORM` variable may be set
-to specify a target platform name.
+to specify a target platform name (architecture).
 
 For compatibility with CMake versions prior to 3.1, one may specify
 a target platform name optionally at the end of this generator name:

Help/manual/OPTIONS_BUILD.txt

@@ -66,10 +66,12 @@
  Specify platform name if supported by generator.
 
  Some CMake generators support a platform name to be given to the
- native build system to choose a compiler or SDK.  This is supported only on
- specific generators::
+ native build system to choose a compiler or SDK.  See the
+ :variable:`CMAKE_GENERATOR_PLATFORM` variable.
+ This is supported only on specific generators:
 
-   Visual Studio >= 8
+ * For :ref:`Visual Studio Generators` with VS 2005 and above this
+   specifies the target architecture.
 
  See native build system documentation for allowed platform names.