Fixing typos in the Network Communication help article

Review URL: https://codereview.chromium.org/618053002

Cr-Commit-Position: refs/heads/master@{#304047}

diff --git a/chrome/common/extensions/docs/templates/articles/app_network.html b/chrome/common/extensions/docs/templates/articles/app_network.html
index 9b9aba36..a0f0273 100644
--- a/chrome/common/extensions/docs/templates/articles/app_network.html
+++ b/chrome/common/extensions/docs/templates/articles/app_network.html

@@ -230,7 +230,7 @@
 
 <pre>
 function listenAndAccept(socketId) {
-  chrome.sockets.tcp.listen(socketId,
+  chrome.sockets.tcpServer.listen(socketId,
     IP, PORT, function(resultCode) {
       onListenCallback(socketId, resultCode)
   });
@@ -275,8 +275,12 @@
       console.log("Data sent to new TCP client connection.")
   });
   // Start receiving data.
-  chrome.sockets.tcp.onReceive(info.clientSocketId, onReceive);
-  chrome.sockets.tco.setPaused(false);
+  chrome.sockets.tcp.onReceive.addListener(function(recvInfo) {
+    if (recvInfo.socketId != info.clientSocketId)
+      return;
+    // recvInfo.data is an arrayBuffer.
+  });
+  chrome.sockets.tcp.setPaused(false);
 }
 </pre>