display: add documentation in set rotation angle

Prevent to confuse the meaning of function

Change-Id: Ic40d7e830739eac643691994057d7ef240dd207b
Signed-off-by: TaeminYeom <taemin.yeom@samsung.com>

diff --git a/include/display-internal.h b/include/display-internal.h
index 4872c92..908edc3 100644 (file)
--- a/include/display-internal.h
+++ b/include/display-internal.h
@@ -201,6 +201,8 @@ int device_display_get_rotation_angle(int display_index, device_display_rotation
  * @since_tizen 7.0
  * @privilege %http://tizen.org/privilege/display
  * @remarks It shows the physical display angle, not SW screen angle.
+ *          It is function to set specific fixed angle, not for additional turning.
+ *          For example, when this function called with same angle twice, there will be no actual action on the second call.
  * @param[in] display_index The index of the display \n
  *                          It can be greater than or equal to @c 0 and less than the number of displays returned by device_display_get_numbers(). \n
  *                          The index zero is always assigned to the main display