drm: Few typo fixes

s/instatiated/instantiated/
s/unreference/unreferenced/

Signed-off-by: Bhaskar Chowdhury <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/drm_property.c

···
  * property types and ranges.
  *
  * Properties don't store the current value directly, but need to be
- * instatiated by attaching them to a &drm_mode_object with
+ * instantiated by attaching them to a &drm_mode_object with
  * drm_object_attach_property().
  *
  * Property values are only 64bit. To support bigger piles of data (like gamma
···
  * @id: id of the blob property
  *
  * If successful, this takes an additional reference to the blob property.
- * callers need to make sure to eventually unreference the returned property
+ * callers need to make sure to eventually unreferenced the returned property
  * again, using drm_property_blob_put().
  *
  * Return: