Don't use deprecated functionality.

doc/generated/hello.cpp

@@ -23,11 +23,11 @@
     DEALINGS IN THE SOFTWARE.
 */
 
-#include <Magnum/Color.h>
-#include <Magnum/DefaultFramebuffer.h>
 #include <Magnum/Context.h>
+#include <Magnum/DefaultFramebuffer.h>
 #include <Magnum/Renderer.h>
 #include <Magnum/Version.h>
+#include <Magnum/Magnum/Color.h>
 #include <Magnum/Platform/Sdl2Application.h>
 
 using namespace Magnum;

doc/getting-started.dox

@@ -187,10 +187,10 @@ the concepts of graphics programming, we can change clear color to something
 else and also print basic information about the GPU the engine is running on.
 First include the needed headers:
 @code
-#include <Magnum/Color.h>
 #include <Magnum/Context.h>
 #include <Magnum/Renderer.h>
 #include <Magnum/Version.h>
+#include <Magnum/Math/Color.h>
 @endcode
 
 And in the constructor (which is currently empty) change the clear color and

doc/platform.dox

@@ -66,9 +66,9 @@ blue color is shown in the following code listing.
     repository.
 
 @code
-#include <Magnum/Color.h>
 #include <Magnum/DefaultFramebuffer.h>
 #include <Magnum/Renderer.h>
+#include <Magnum/Math/Color.h>
 #include <Magnum/Platform/Sdl2Application.h>
 
 using namespace Magnum;