Fix bad javadoc issues

common/src/main/java/me/lucko/luckperms/users/User.java

@@ -265,6 +265,7 @@ public abstract class User extends PermissionObject {
     /**
      * Get a {@link List} of the groups the user is a member of on a specific server
      * @param server the server to check
+     * @param world the world to check
      * @return a {@link List} of group names
      */
     public List<String> getLocalGroups(String server, String world) {

common/src/main/java/me/lucko/luckperms/users/UserManager.java

@@ -48,7 +48,7 @@ public abstract class UserManager {
     }
 
     /**
-     * Add a user to the {@link #getUsers()} map
+     * Add a user to the users map
      * @param user the user to add
      */
     public void setUser(User user) {
@@ -56,7 +56,7 @@ public abstract class UserManager {
     }
 
     /**
-     * Updates (or sets if the user wasn't already loaded) a user in the {@link #getUsers()} map
+     * Updates (or sets if the user wasn't already loaded) a user in the users map
      * @param user The user to update or set
      */
     public void updateOrSetUser(User user) {