drm/drm_plane.h: fix grammar of the comment

Signed-off-by: NSui Jingfeng <suijingfeng@loongson.cn>
Link: https://patchwork.freedesktop.org/patch/msgid/20230409131547.494128-1-15330273260@189.cnSigned-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

include/drm/drm_plane.h

@@ -56,7 +56,7 @@ struct drm_plane_state {
 	/**
 	 * @crtc:
 	 *
-	 * Currently bound CRTC, NULL if disabled. Do not this write directly,
+	 * Currently bound CRTC, NULL if disabled. Do not write this directly,
 	 * use drm_atomic_set_crtc_for_plane()
 	 */
 	struct drm_crtc *crtc;