Update CONTRIBUTING.md

Author: ryanfoxtyler

CONTRIBUTING.md

@@ -113,7 +113,7 @@ For Dgraph official documentation, visit https://dgraph.io/docs/.
 For discussions about Dgraph     , visit https://discuss.dgraph.io.
 
 Licensed variously under the Apache Public License 2.0 and Dgraph Community License.
-Copyright 2015-2025 Hypermode Inc.
+© Hypermode Inc.
 ```
 
 ### Build Docker Image
@@ -148,7 +148,7 @@ For Dgraph official documentation, visit https://dgraph.io/docs/.
 For discussions about Dgraph     , visit https://discuss.dgraph.io.
 
 Licensed variously under the Apache Public License 2.0 and Dgraph Community License.
-Copyright 2015-2025 Hypermode Inc.
+© Hypermode Inc.
 ```
 
 ### Testing
@@ -227,20 +227,9 @@ under the Apache 2.0 license:
 
 ```sh
 /*
-  * Copyright 2016-2025 Hypermode Inc. and Contributors
-  *
-  * 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
-  *
-  * Unless required by applicable law or agreed to in writing, software
-  * distributed under the License is distributed on an "AS IS" BASIS,
-  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  * See the License for the specific language governing permissions and
-  * limitations under the License.
-  */
+ * SPDX-FileCopyrightText: © Hypermode Inc. <hello@hypermode.com>
+ * SPDX-License-Identifier: Apache-2.0
+ */
 ```
 
 ### Signed Commits