drm/i915/ttm: fix i915_ttm_to_gem() kernel-doc

drivers/gpu/drm/i915/gem/i915_gem_ttm.h:50: warning: Function parameter or member 'bo' not described in 'i915_ttm_to_gem'

v2: Fix return value documentation while at it (Rodrigo)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230504092320.1787627-1-jani.nikula@intel.com

drivers/gpu/drm/i915/gem/i915_gem_ttm.h

@@ -42,8 +42,9 @@ static inline bool i915_ttm_is_ghost_object(struct ttm_buffer_object *bo)
 /**
  * i915_ttm_to_gem - Convert a struct ttm_buffer_object to an embedding
  * struct drm_i915_gem_object.
+ * @bo: Pointer to the ttm buffer object
  *
- * Return: Pointer to the embedding struct ttm_buffer_object.
+ * Return: Pointer to the embedding struct drm_i915_gem_object.
  */
 static inline struct drm_i915_gem_object *
 i915_ttm_to_gem(struct ttm_buffer_object *bo)