adding metadata for new OBS doc type and small fixes in titles of somes

ervices

metadata.yaml

@@ -376,6 +376,11 @@ categories:
           type: pfs
           pdf_name: obs-pfs
           hc_location: pfs/obs
+        - html_location: docs/obs/perms-cfg
+          rst_location: doc/perms-cfg/source
+          title: Permissions Configuration Guide
+          type: perms-cfg
+          pdf_name: obs-perms-cfg
         - html_location: docs/obs/api-swift
           rst_location: doc/swiftapi/source
           title: API Reference (Swift)
@@ -456,7 +461,7 @@ categories:
           permission: write
       repository: docs/volume-backup-service
   container:
-    - service_title: Cloud Container Service
+    - service_title: Cloud Container Engine
       service_type: cce
       docs:
         - html_location: docs/cce/api-ref
@@ -846,7 +851,7 @@ categories:
         - name: docs-network-rw
           permission: write
       repository: docs/nat-gateway
-    - service_title: Private Link Access
+    - service_title: Private Link Access Service
       service_type: plas
       docs:
         - html_location: docs/plas/api-ref