drm/amd/display: Document num_rmcm_3dluts in mpc_color_caps

Fix a kernel-doc warning by documenting the num_rmcm_3dluts member of struct mpc_color_caps.

v2: improve comment (Melissa)

Signed-off-by: Kavithesh A.S <kavitheshnitt@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: kavitheshAS

drivers/gpu/drm/amd/display/dc/dc.h

@@ -234,6 +234,7 @@ struct lut3d_caps {
  * @ogam_ram: programmable out gamma LUT
  * @ocsc: output color space conversion matrix
  * @num_3dluts: MPC 3D LUT; always assumes a preceding shaper LUT
+ * @num_rmcm_3dluts: number of RMCM 3D LUTS; always assumes a preceding shaper LUT
  * @shared_3d_lut: shared 3D LUT flag. Can be either DPP or MPC, but single
  * instance
  * @ogam_rom_caps: pre-definied curve caps for regamma 1D LUT