drm/atomic: Remove inexistent reference

Commit 63e83c1 ("drm: Consolidate connector arrays in
drm_atomic_state") removed the connector_states field but didn't remove
its mention in the num_connectors documentation.

Acked-by: Sui Jingfeng <sui.jingfeng@linux.dev>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://lore.kernel.org/r/20231214100917.277842-2-mripard@kernel.org
Signed-off-by: Maxime Ripard <mripard@kernel.org>

include/drm/drm_atomic.h

@@ -413,7 +413,7 @@ struct drm_atomic_state {
 	struct __drm_crtcs_state *crtcs;
 
 	/**
-	 * @num_connector: size of the @connectors and @connector_states arrays
+	 * @num_connector: size of the @connectors array
 	 */
 	int num_connector;