Update content/en/docs/concepts/extend-kubernetes/operator.md

Co-authored-by: Tim Bannister <tim@scalefactory.com>

Author: able8

content/en/docs/concepts/extend-kubernetes/operator.md

@@ -129,7 +129,7 @@ operator.
 
 
 * Read the {{< glossary_tooltip text="CNCF" term_id="cncf" >}}
-  [Operator White Paper](http://github.com/cncf/tag-app-delivery/blob/main/operator-wg/whitepaper/Operator-WhitePaper_v1-0.md).
+  [Operator White Paper](http://github.com/cncf/tag-app-delivery/blob/163962c4b1cd70d085107fc579e3e04c2e14d59c/operator-wg/whitepaper/Operator-WhitePaper_v1-0.md).
 * Learn more about [Custom Resources](/docs/concepts/extend-kubernetes/api-extension/custom-resources/)
 * Find ready-made operators on [OperatorHub.io](http://operatorhub.io/) to suit your use case
 * [Publish](http://operatorhub.io/) your operator for other people to use