fix : Renaming for matching purpose with the course + added precision to the signals comments

src/main/java/io/takima/temporalpractice/bakery/KitchenApp.java → src/main/java/io/takima/temporalpractice/bakery/CookieOrderer.java

 package io.takima.temporalpractice.bakery;
 
-public class KitchenApp {
+public class CookieOrderer {
     public static void main(String[] args) {
     }
 }

src/main/java/io/takima/temporalpractice/bakery/batter/BatterService.java

 package io.takima.temporalpractice.bakery.batter;
 
 public interface BatterService {
-    void prepareCookieBatter();
+    void prepareBatter();
 }

src/main/java/io/takima/temporalpractice/signals/InventoryActivity.java

 package io.takima.temporalpractice.signals;
-// TODO : remove comments when starting the mastering signals exercise
+// TODO : remove comments when starting the mastering signals exercise on day 2
 //@ActivityInterface
 public interface InventoryActivity {
     void reserve(ConsumeSignal input);

src/main/java/io/takima/temporalpractice/signals/InventoryWorkflow.java

 package io.takima.temporalpractice.signals;
-// TODO : remove comments when starting the mastering signals exercise
+// TODO : remove comments when starting the mastering signals exercise on day 2
 //@WorkflowInterface
 public interface InventoryWorkflow {
 //    @WorkflowMethod

src/main/java/io/takima/temporalpractice/signals/MSMain.java

 package io.takima.temporalpractice.signals;
-// TODO : remove comments when starting the mastering signals exercise
+// TODO : remove comments when starting the mastering signals exercise on day 2
 //import io.temporal.client.WorkflowClient;
 //import io.temporal.client.WorkflowOptions;