Fix: all JavaDOC completed

src/main/java/it/polimi/ingsw/gc14/Model/Player.java

@@ -31,7 +31,7 @@ public class Player implements Serializable {
     // region Getters
     /**
      * Unique string identifier for players; must not be {@code null} and must not
-     * exceed {@link #MAX_VALUE} otherwise an {@link IllegalArgumentException} will be thrown
+     * exceed {@link #MAX_USERNAME_LENGTH} otherwise an {@link IllegalArgumentException} will be thrown
      * when the {@link #Player(String) constructor} is called.
      */
     private final String userName;
@@ -224,7 +224,13 @@ public class Player implements Serializable {
 
     // region Functions
 
-    // TODO
+    /**
+     * Checks equality between this {@code Player} and another object.
+     * Two players are equal if and only if they share the same {@code userName}.
+     *
+     * @param obj the object to compare with.
+     * @return {@code true} if {@code obj} is a {@code Player} with the same username; {@code false} otherwise.
+     */
     @Override
     public boolean equals(Object obj) {
         if (this == obj) return true;