Modified reference to Leonardo only in the examples

According to #3786 removed the reference to Leonardo only in while(!Serial) of the examples.
Changed in in "wait for serial port to connect. Needed for native USB port only"

examples/ConnectNoEncryption/ConnectNoEncryption.ino

@@ -22,7 +22,7 @@ void setup() {
   //Initialize serial and wait for port to open:
   Serial.begin(9600);
   while (!Serial) {
-    ; // wait for serial port to connect. Needed for Leonardo only
+    ; // wait for serial port to connect. Needed for native USB port only
   }
 
   // check for the presence of the shield:

examples/ConnectWithWEP/ConnectWithWEP.ino

@@ -34,7 +34,7 @@ void setup() {
   //Initialize serial and wait for port to open:
   Serial.begin(9600);
   while (!Serial) {
-    ; // wait for serial port to connect. Needed for Leonardo only
+    ; // wait for serial port to connect. Needed for native USB port only
   }
 
   // check for the presence of the shield:

examples/ConnectWithWPA/ConnectWithWPA.ino

@@ -23,7 +23,7 @@ void setup() {
   //Initialize serial and wait for port to open:
   Serial.begin(9600);
   while (!Serial) {
-    ; // wait for serial port to connect. Needed for Leonardo only
+    ; // wait for serial port to connect. Needed for native USB port only
   }
 
   // check for the presence of the shield:

examples/ScanNetworks/ScanNetworks.ino

@@ -22,7 +22,7 @@ void setup() {
   //Initialize serial and wait for port to open:
   Serial.begin(9600);
   while (!Serial) {
-    ; // wait for serial port to connect. Needed for Leonardo only
+    ; // wait for serial port to connect. Needed for native USB port only
   }
 
   // check for the presence of the shield:

examples/WiFiChatServer/WiFiChatServer.ino

@@ -37,7 +37,7 @@ void setup() {
   //Initialize serial and wait for port to open:
   Serial.begin(9600);
   while (!Serial) {
-    ; // wait for serial port to connect. Needed for Leonardo only
+    ; // wait for serial port to connect. Needed for native USB port only
   }
 
   // check for the presence of the shield:

examples/WiFiUdpNtpClient/WiFiUdpNtpClient.ino

@@ -40,7 +40,7 @@ void setup() {
   // Open serial communications and wait for port to open:
   Serial.begin(9600);
   while (!Serial) {
-    ; // wait for serial port to connect. Needed for Leonardo only
+    ; // wait for serial port to connect. Needed for native USB port only
   }
 
   // check for the presence of the shield:

examples/WiFiUdpSendReceiveString/WiFiUdpSendReceiveString.ino

@@ -34,7 +34,7 @@ void setup() {
   //Initialize serial and wait for port to open:
   Serial.begin(9600);
   while (!Serial) {
-    ; // wait for serial port to connect. Needed for Leonardo only
+    ; // wait for serial port to connect. Needed for native USB port only
   }
 
   // check for the presence of the shield:

examples/WiFiWebClient/WiFiWebClient.ino

@@ -43,7 +43,7 @@ void setup() {
   //Initialize serial and wait for port to open:
   Serial.begin(9600);
   while (!Serial) {
-    ; // wait for serial port to connect. Needed for Leonardo only
+    ; // wait for serial port to connect. Needed for native USB port only
   }
 
   // check for the presence of the shield:

examples/WiFiWebClientRepeating/WiFiWebClientRepeating.ino

@@ -40,7 +40,7 @@ void setup() {
   //Initialize serial and wait for port to open:
   Serial.begin(9600);
   while (!Serial) {
-    ; // wait for serial port to connect. Needed for Leonardo only
+    ; // wait for serial port to connect. Needed for native USB port only
   }
 
   // check for the presence of the shield:

examples/WiFiWebServer/WiFiWebServer.ino

@@ -34,7 +34,7 @@ void setup() {
   //Initialize serial and wait for port to open:
   Serial.begin(9600);
   while (!Serial) {
-    ; // wait for serial port to connect. Needed for Leonardo only
+    ; // wait for serial port to connect. Needed for native USB port only
   }
 
   // check for the presence of the shield: