rdmacg: fix kernel-doc warnings in rdmacg

Fix all kernel-doc warnings in rdmacg:

kernel/cgroup/rdma.c:209: warning: Function parameter or member 'cg'
not described in 'rdmacg_uncharge_hierarchy'
kernel/cgroup/rdma.c:230: warning: Function parameter or member 'cg'
not described in 'rdmacg_uncharge'
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

kernel/cgroup/rdma.c

@@ -197,6 +197,7 @@ uncharge_cg_locked(struct rdma_cgroup *cg,
 
 /**
  * rdmacg_uncharge_hierarchy - hierarchically uncharge rdma resource count
+ * @cg: pointer to cg to uncharge and all parents in hierarchy
  * @device: pointer to rdmacg device
  * @stop_cg: while traversing hirerchy, when meet with stop_cg cgroup
  *           stop uncharging
@@ -221,6 +222,7 @@ static void rdmacg_uncharge_hierarchy(struct rdma_cgroup *cg,
 
 /**
  * rdmacg_uncharge - hierarchically uncharge rdma resource count
+ * @cg: pointer to cg to uncharge and all parents in hierarchy
  * @device: pointer to rdmacg device
  * @index: index of the resource to uncharge in cgroup in given resource pool
  */