drm/amdgpu: add missing documentation on new module parameters

	"Asynchronous GFX rings that could be configured with either different priorities (HP3D ring and LP3D ring), or equal priorities (0 = disabled, 1 = enabled (default))");

module_param_named(async_gfx_ring, amdgpu_async_gfx_ring, int, 0444);

/**

 * DOC: mcbp (int)

 * It is used to enable mid command buffer preemption. (0 = disabled (default), 1 = enabled)

 */

MODULE_PARM_DESC(mcbp,

	"Enable Mid-command buffer preemption (0 = disabled (default), 1 = enabled)");

module_param_named(mcbp, amdgpu_mcbp, int, 0444);

/**

 * DOC: discovery (int)

 * Allow driver to discover hardware IP information from IP Discovery table at the top of VRAM.

 */

MODULE_PARM_DESC(discovery,

	"Allow driver to discover hardware IPs from IP Discovery table at the top of VRAM");

module_param_named(discovery, amdgpu_discovery, int, 0444);

/**

 * DOC: mes (int)

 * Enable Micro Engine Scheduler. This is a new hw scheduling engine for gfx, sdma, and compute.

 * (0 = disabled (default), 1 = enabled)

 */

MODULE_PARM_DESC(mes,

	"Enable Micro Engine Scheduler (0 = disabled (default), 1 = enabled)");

module_param_named(mes, amdgpu_mes, int, 0444);