drm/atomic: Fix typo in kerneldoc

The for_each_crtc_in_state() is used to iterate over CRTCs rather than
connectors.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170901144042.6023-2-thierry.reding@gmail.com

include/drm/drm_atomic.h

@@ -643,7 +643,7 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
 		for_each_if (connector)
 
 /**
- * for_each_crtc_in_state - iterate over all connectors in an atomic update
+ * for_each_crtc_in_state - iterate over all CRTCs in an atomic update
  * @__state: &struct drm_atomic_state pointer
  * @crtc: &struct drm_crtc iteration cursor
  * @crtc_state: &struct drm_crtc_state iteration cursor