Fix link to openAPI example

Author: fabauCap

modules/ROOT/pages/integration/rest_openapi.adoc

@@ -293,7 +293,7 @@ Maven::
 
 == References
 
-- link:https://github.com/devonfw-sample/java-samples/tree/master/examples/service/rest-openapi[Example Project]
+- link:https://github.com/devonfw/java-samples/tree/main/integration/rest-openapi[Example Project]
 - https://oai.github.io/Documentation/best-practices.html
 - https://openapi-generator.tech/docs/generators