drm/ttm/ttm_tt: Demote kernel-doc header format abuses

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/ttm/ttm_tt.c:45: warning: Function parameter or member 'bo' not described in 'ttm_tt_create'
 drivers/gpu/drm/ttm/ttm_tt.c:45: warning: Function parameter or member 'zero_alloc' not described in 'ttm_tt_create'
 drivers/gpu/drm/ttm/ttm_tt.c:83: warning: Function parameter or member 'ttm' not described in 'ttm_tt_alloc_page_directory'

Cc: Christian Koenig <christian.koenig@amd.com>
Cc: Huang Rui <ray.huang@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20201116174112.1833368-33-lee.jones@linaro.org

drivers/gpu/drm/ttm/ttm_tt.c

@@ -38,7 +38,7 @@
 #include <drm/drm_cache.h>
 #include <drm/ttm/ttm_bo_driver.h>
 
-/**
+/*
  * Allocates a ttm structure for the given BO.
  */
 int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
@@ -73,7 +73,7 @@ int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
 	return 0;
 }
 
-/**
+/*
  * Allocates storage for pointers to the pages that back the ttm.
  */
 static int ttm_tt_alloc_page_directory(struct ttm_tt *ttm)