kernel-doc: fix new warning in net/phy/mdio_bus.c

Fix new kernel-doc warning:

Warning(drivers/net/phy/mdio_bus.c:49): No description found for parameter 'size'
Signed-off-by: NRandy Dunlap <rdunlap@xenotime.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/phy/mdio_bus.c

@@ -38,12 +38,11 @@
 
 /**
  * mdiobus_alloc_size - allocate a mii_bus structure
+ * @size: extra amount of memory to allocate for private storage.
+ * If non-zero, then bus->priv is points to that memory.
  *
  * Description: called by a bus driver to allocate an mii_bus
  * structure to fill in.
- *
- * 'size' is an an extra amount of memory to allocate for private storage.
- * If non-zero, then bus->priv is points to that memory.
  */
 struct mii_bus *mdiobus_alloc_size(size_t size)
 {