drm/ttm/ttm_range_manager: Demote non-conformant kernel-doc header

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

 drivers/gpu/drm/ttm/ttm_range_manager.c:46: warning: cannot understand function prototype: 'struct ttm_range_manager '
Reviewed-by: Christian König <christian.koenig@amd.com>
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/20201116174112.1833368-34-lee.jones@linaro.org

drivers/gpu/drm/ttm/ttm_range_manager.c

@@ -37,7 +37,7 @@
 #include <linux/spinlock.h>
 #include <linux/module.h>
 
-/**
+/*
  * Currently we use a spinlock for the lock, but a mutex *may* be
  * more appropriate to reduce scheduling latency if the range manager
  * ends up with very fragmented allocation patterns.