renaming dms and splitting rocketmq to new service

Reviewed-by: Gode, Sebastian <sebastian.gode@t-systems.com>
Co-authored-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>
Co-committed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>

otc_metadata/data/documents/dms_rocketmq-umn.yaml

@@ -0,0 +1,13 @@
+---
+hc_location: usermanual/hrm
+html_location: docs/dms_rocketmq/umn
+link: /distributed-message-service-rocketmq/umn/
+rst_location: umn/source
+service_type: dms_rocketmq
+title: User Guide
+type: umn
+cloud_environments:
+  - name: eu_de
+    visibility: internal
+    pdf_visibility: public
+    pdf_enabled: true