Fix packet typo (#4621)

* Fix packet typo

* Another packet typo fix

Author: JosefKuchar

doc/esp8266wifi/udp-examples.rst

@@ -36,7 +36,7 @@ Once we have libraries in place we need to create a ``WiFiUDP`` object. Then we
     WiFiUDP Udp;
     unsigned int localUdpPort = 4210;
     char incomingPacket[255];
-    char  replyPacekt[] = "Hi there! Got the message :-)";
+    char replyPacket[] = "Hi there! Got the message :-)";
 
 Wi-Fi Connection
 ~~~~~~~~~~~~~~~~
@@ -85,7 +85,7 @@ For each received packet we are sending back an acknowledge packet:
 .. code:: cpp
 
     Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());
-    Udp.write(replyPacekt);
+    Udp.write(replyPacket);
     Udp.endPacket();
 
 Please note we are sending reply to the IP and port of the sender by using ``Udp.remoteIP()`` and ``Udp.remotePort()``.