Clean up copyright wording (opensearch-project#73)

Signed-off-by: Tyler Ohlsen <ohltyler@amazon.com>

Author: ohltyler

NOTICE.txt

@@ -1,2 +1,2 @@
 OpenSearch Anomaly Detection Dashboards
-Copyright 2021 OpenSearch Contributors
+Copyright OpenSearch Contributors

README.md

@@ -45,4 +45,4 @@ This project is licensed under the [Apache v2.0 License](LICENSE.txt).
 
 ## Copyright
 
-Copyright 2020-2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+Copyright OpenSearch Contributors. See [NOTICE](NOTICE.txt) for details.

public/pages/Overview/components/CreateWorkflowStepDetails.tsx

@@ -1,16 +1,12 @@
 /*
- * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
  *
- * Licensed under the Apache License, Version 2.0 (the "License").
- * You may not use this file except in compliance with the License.
- * A copy of the License is located at
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
  *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * or in the "license" file accompanying this file. This file 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.
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
  */
 
 import {

public/pages/Overview/components/CreateWorkflowStepSeparator.tsx

@@ -1,17 +1,14 @@
 /*
- * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
  *
- * Licensed under the Apache License, Version 2.0 (the "License").
- * You may not use this file except in compliance with the License.
- * A copy of the License is located at
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
  *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * or in the "license" file accompanying this file. This file 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.
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
  */
+
 import { EuiFlexItem } from '@elastic/eui';
 import React from 'react';