Update Kerberos Sample Copyright

Issue gh-17879

docs/modules/ROOT/examples/kerberos/SpnegoConfig.java

@@ -1,11 +1,11 @@
 /*
- * Copyright 2015 the original author or authors.
+ * Copyright 2004-present the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
- * http://www.apache.org/licenses/LICENSE-2.0
+ *      https://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.kerberos.docs;
 
 import org.springframework.beans.factory.annotation.Value;