drm/amdgpu: Add missing function parameter 'optc' & 'enable' to kdoc in...

drm/amdgpu: Add missing function parameter 'optc' & 'enable' to kdoc in optc3_set_timing_double_buffer()

Fixes the following gcc with W=1:

drivers/gpu/drm/amd/amdgpu/../display/dc/dcn30/dcn30_optc.c:285: warning: Function parameter or member 'optc' not described in 'optc3_set_timing_double_buffer'
drivers/gpu/drm/amd/amdgpu/../display/dc/dcn30/dcn30_optc.c:285: warning: Function parameter or member 'enable' not described in 'optc3_set_timing_double_buffer'

Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_optc.c

@@ -279,6 +279,9 @@ static void optc3_set_odm_combine(struct timing_generator *optc, int *opp_id, in
  * Sets double buffer point for V_TOTAL, H_TOTAL, VTOTAL_MIN,
  * VTOTAL_MAX, VTOTAL_MIN_SEL and VTOTAL_MAX_SEL registers.
  *
+ * @optc: timing_generator instance.
+ * @enable: Enable DRR double buffering control if true, disable otherwise.
+ *
  * Options: any time,  start of frame, dp start of frame (range timing)
  */
 static void optc3_set_timing_double_buffer(struct timing_generator *optc, bool enable)