fix: Fix generic type for deques in command README.md files Ref: iluwatar#2462 (iluwatar#2484)

Co-authored-by: Antonio Addeo <[email protected]>

Author: AddeusExMachina

command/README.md

@@ -40,8 +40,8 @@ Here's the sample code with wizard and goblin. Let's start from the `Wizard` cla
 @Slf4j
 public class Wizard {
 
-  private final Deque<Command> undoStack = new LinkedList<>();
-  private final Deque<Command> redoStack = new LinkedList<>();
+  private final Deque<Runnable> undoStack = new LinkedList<>();
+  private final Deque<Runnable> redoStack = new LinkedList<>();
 
   public Wizard() {}
 

localization/zh/command/README.md

@@ -34,8 +34,8 @@ public class Wizard {
 
   private static final Logger LOGGER = LoggerFactory.getLogger(Wizard.class);
 
-  private final Deque<Command> undoStack = new LinkedList<>();
-  private final Deque<Command> redoStack = new LinkedList<>();
+  private final Deque<Runnable> undoStack = new LinkedList<>();
+  private final Deque<Runnable> redoStack = new LinkedList<>();
 
   public Wizard() {}