drm/amdgpu: fix typo in amdgpu_mn.c comments

In doc comments for struct amdgpu_mn: destrution -> destruction
Signed-off-by: Slava Abramov <slava.abramov@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c

@@ -59,7 +59,7 @@
  * @adev: amdgpu device pointer
  * @mm: process address space
  * @mn: MMU notifier structur
- * @work: destrution work item
+ * @work: destruction work item
  * @node: hash table node to find structure by adev and mn
  * @lock: rw semaphore protecting the notifier nodes
  * @objects: interval tree containing amdgpu_mn_nodes