drm/mode_object: fix documentation for object lookups.

The lease updates missed a few bits of docs, fixed up
the wrong name on the property lookup fn as well.

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/include/drm/drm_encoder.h b/include/drm/drm_encoder.h
index 86db0da..ee4cfbe 100644
--- a/include/drm/drm_encoder.h
+++ b/include/drm/drm_encoder.h
@@ -208,6 +208,7 @@ static inline bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
 /**
  * drm_encoder_find - find a &drm_encoder
  * @dev: DRM device
+ * @file_priv: drm file to check for lease against.
  * @id: encoder id
  *
  * Returns the encoder with @id, NULL if it doesn't exist. Simple wrapper around