Update pixel design documentation for MP11 changes (#626)

Update documentation after #274.

doc/design/pixel.rst

@@ -183,13 +183,13 @@ such packed pixel formats:
 .. code-block:: cpp
 
   // define an rgb565 pixel
-  typedef packed_pixel_type<uint16_t, mpl::vector3_c<unsigned,5,6,5>, rgb_layout_t>::type rgb565_pixel_t;
+  typedef packed_pixel_type<uint16_t, mp11::mp_list_c<unsigned,5,6,5>, rgb_layout_t>::type rgb565_pixel_t;
 
   function_requires<PixelValueConcept<rgb565_pixel_t> >();
   static_assert(sizeof(rgb565_pixel_t) == 2, "");
 
   // define a bgr556 pixel
-  typedef packed_pixel_type<uint16_t, mpl::vector3_c<unsigned,5,6,5>, bgr_layout_t>::type bgr556_pixel_t;
+  typedef packed_pixel_type<uint16_t, mp11::mp_list_c<unsigned,5,6,5>, bgr_layout_t>::type bgr556_pixel_t;
 
   function_requires<PixelValueConcept<bgr556_pixel_t> >();
 
@@ -211,7 +211,7 @@ pixels and pixel iterators:
 .. code-block:: cpp
 
   // Mutable reference to a BGR232 pixel
-  typedef const bit_aligned_pixel_reference<unsigned char, mpl::vector3_c<unsigned,2,3,2>, bgr_layout_t, true>  bgr232_ref_t;
+  typedef const bit_aligned_pixel_reference<unsigned char, mp11::mp_list_c<unsigned,2,3,2>, bgr_layout_t, true>  bgr232_ref_t;
 
   // A mutable iterator over BGR232 pixels
   typedef bit_aligned_pixel_iterator<bgr232_ref_t> bgr232_ptr_t;
@@ -255,7 +255,7 @@ algorithms and metafunctions of color bases can work with them as well:
   BOOST_MPL_ASSERT(num_channels<rgb8_pixel_t>::value == 3);
   BOOST_MPL_ASSERT((is_same<channel_type<rgb8_pixel_t>::type, bits8>));
   BOOST_MPL_ASSERT((is_same<color_space_type<bgr8_pixel_t>::type, rgb_t> ));
-  BOOST_MPL_ASSERT((is_same<channel_mapping_type<bgr8_pixel_t>::type, mpl::vector3_c<int,2,1,0> > ));
+  BOOST_MPL_ASSERT((is_same<channel_mapping_type<bgr8_pixel_t>::type, mp11::mp_list_c<int,2,1,0> > ));
 
   // Pixels contain just the three channels and nothing extra
   BOOST_MPL_ASSERT(sizeof(rgb8_pixel_t)==3);