Fix tabs in overview examples.

doc.go

@@ -11,14 +11,14 @@
 // Conn:
 //
 //  func handler(w http.ResponseWriter, r *http.Request) {
-//	    ws, err := websocket.Upgrade(w, r, nil, 1024, 1024)
-//	    if _, ok := err.(websocket.HandshakeError); ok {
-//		    http.Error(w, "Not a websocket handshake", 400)
-//		    return
-//	    } else if err != nil {
-//		    log.Println(err)
-//		    return
-//	    }
+//      ws, err := websocket.Upgrade(w, r, nil, 1024, 1024)
+//      if _, ok := err.(websocket.HandshakeError); ok {
+//          http.Error(w, "Not a websocket handshake", 400)
+//          return
+//      } else if err != nil {
+//          log.Println(err)
+//          return
+//      }
 //      ... Use conn to send and receive messages.
 //  }
 //