drm/amdgpu: update documentation for amdgpu_drv.c

Signed-off-by: Sonny Jiang <sonny.jiang@amd.com>
Acked-by: Junwei Zhang <Jerry.Zhang@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Documentation/gpu/amdgpu.rst

@@ -5,6 +5,13 @@
 The drm/amdgpu driver supports all AMD Radeon GPUs based on the Graphics Core
 Next (GCN) architecture.
 
+Module Parameters
+=================
+
+The amdgpu driver supports the following module parameters:
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+
 Core Driver Infrastructure
 ==========================