Now that we don't have automatic syntax highlighting, use the code-block
directive with the explicitly selected language, where appropriate.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
 Output discovery and initialization example
 -------------------------------------------
 
-::
+.. code-block:: c
 
     void intel_crt_init(struct drm_device *dev)
     {
 
 
 The ttm_global_reference structure is made up of several fields:
 
-::
+.. code-block:: c
 
               struct ttm_global_reference {
                       enum ttm_global_types global_type;