added new ddm service, obs pfs document, modelarts sdk document metadata

Reviewed-by: Kvrivishvili, Iustina <iustina.kvrivishvili@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/services.yaml

@@ -214,6 +214,22 @@ documents:
     service_type: dcs
     title: User Guide
     type: umn
+  - hc_location: api/ddm
+    html_location: docs/ddm/api-ref
+    link: /distributed-database-middleware/api-ref/
+    pdf_name: ddm-api-ref
+    rst_location: api-ref/source
+    service_type: ddm
+    title: API Reference
+    type: api-ref
+  - hc_location: usermanual/ddm
+    html_location: docs/ddm/umn
+    link: /distributed-database-middleware/umn/
+    pdf_name: ddm-umn
+    rst_location: umn/source
+    service_type: ddm
+    title: User Guide
+    type: umn
   - hc_location: api/dds
     html_location: docs/dds/api-ref
     link: /document-database-service/api-ref/
@@ -565,6 +581,14 @@ documents:
     service_type: ma
     title: User Guide
     type: umn
+  - hc_location: sdk/ma
+    html_location: docs/modelarts/sdk-ref
+    link: /modelarts/sdk-ref/
+    pdf_name: ma-sdk-ref
+    rst_location: doc/sdk-ref/source
+    service_type: ma
+    title: ModelArts Software Development Kit (ModelArts SDK)
+    type: sdk-ref
   - hc_location: api/mrs
     html_location: docs/mrs/api-ref
     link: /mapreduce-service/api-ref/
@@ -629,6 +653,14 @@ documents:
     service_type: obs
     title: Tool Guide (OBS Browser)
     type: tool-guide
+  - hc_location: pfs/obs
+    html_location: docs/obs/pfs
+    link: /object-storage-service/parallel-file-system/
+    pdf_name: obs-pfs
+    rst_location: doc/pfs/source
+    service_type: obs
+    title: Parallel File System (PFS)
+    type: pfs
   - hc_location: api_swift/obs
     html_location: docs/obs/api-swift
     link: /object-storage-service/swiftapi/