drivers: base/node.c: fixes a kernel-doc markups

There was a typo at the name of the vars inside the kernel-doc
comment, causing those warnings:

	./drivers/base/node.c:690: warning: Function parameter or member 'mem_nid' not described in 'register_memory_node_under_compute_node'
	./drivers/base/node.c:690: warning: Function parameter or member 'cpu_nid' not described in 'register_memory_node_under_compute_node'
	./drivers/base/node.c:690: warning: Excess function parameter 'mem_node' description in 'register_memory_node_under_compute_node'
	./drivers/base/node.c:690: warning: Excess function parameter 'cpu_node' description in 'register_memory_node_under_compute_node'

There's also a description missing here:
	./drivers/base/node.c:78: warning: Function parameter or member 'hmem_attrs' not described in 'node_access_nodes'

Copy an existing description from another function call.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/base/node.c

@@ -66,6 +66,7 @@ static DEVICE_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
  * @dev:	Device for this memory access class
  * @list_node:	List element in the node's access list
  * @access:	The access class rank
+ * @hmem_attrs: Heterogeneous memory performance attributes
  */
 struct node_access_nodes {
 	struct device		dev;
@@ -673,8 +674,8 @@ int register_cpu_under_node(unsigned int cpu, unsigned int nid)
 /**
  * register_memory_node_under_compute_node - link memory node to its compute
  *					     node for a given access class.
- * @mem_node:	Memory node number
- * @cpu_node:	Cpu  node number
+ * @mem_nid:	Memory node number
+ * @cpu_nid:	Cpu  node number
  * @access:	Access class to register
  *
  * Description: