Fix broken docs link in dashboard

Author: filiptronicek

components/dashboard/src/start/StartWorkspace.tsx

@@ -822,7 +822,7 @@ function ImageBuildView(props: ImageBuildViewProps) {
                             💡 You can use the <code>gp validate</code> command to validate the workspace configuration
                             from the editor terminal. &nbsp;
                             <a
-                                href="https://www.gitpod.io/docs/configure/workspaces/workspace-image#trying-out-changes-to-your-dockerfile"
+                                href="https://www.gitpod.io/docs/configure/workspaces#validate-your-gitpod-configuration"
                                 target="_blank"
                                 rel="noopener noreferrer"
                                 className="gp-link"