minor fix

dclock.ino

@@ -53,7 +53,7 @@ void setup() {
     display.print("HAIL_EriS");        // Shows display initialization
   }
   pinMode(buttonPin, INPUT);           // Button setting
-  // Main thread thread initialization:
+  // Main thread initialization:
   mainThread.onRun(mainLoop);
   mainThread.setInterval(mainCheck);
   // Time bias correction thread initialization: