Ethernet: fix comment placing belonging to begin function

Author: pennam

libraries/Ethernet/src/Ethernet.h

@@ -53,12 +53,12 @@ enum {  // compatibility with Arduino ::maintain()
 class EthernetClass : public MbedSocketClass {
 
 public:
-  // Initialise the Ethernet shield to use the provided MAC address and
-  // gain the rest of the configuration through DHCP.
-  // Returns 0 if the DHCP configuration failed, and 1 if it succeeded
   EthernetClass(EthernetInterface *_if)
     : eth_if(_if){};
 
+  // Initialise the Ethernet shield to use the provided MAC address and
+  // gain the rest of the configuration through DHCP.
+  // Returns 0 if the DHCP configuration failed, and 1 if it succeeded
   int begin(uint8_t *mac = nullptr, unsigned long timeout = 60000, unsigned long responseTimeout = 4000);
   EthernetLinkStatus linkStatus();
   EthernetHardwareStatus hardwareStatus();