addressing dollar char in the links

metadata.yaml

@@ -370,12 +370,6 @@ categories:
           type: tool-guide
           pdf_name: obs-tool-guide
           hc_location: browsertg/obs
-        - html_location: docs/obs/pfs
-          rst_location: doc/pfs/source
-          title: Parallel File System (PFS)
-          type: pfs
-          pdf_name: obs-pfs
-          hc_location: pfs/obs
         - html_location: docs/obs/api-swift
           rst_location: doc/swiftapi/source
           title: API Reference (Swift)
@@ -692,12 +686,6 @@ categories:
           type: umn
           pdf_name: ma-umn
           hc_location: usermanual/ma
-        - html_location: docs/modelarts/sdk-ref
-          rst_location: doc/sdk-ref/source
-          title: ModelArts Software Development Kit (ModelArts SDK)
-          type: sdk-ref
-          pdf_name: ma-sdk-ref
-          hc_location: sdk/ma
       teams:
         - name: docs-bigdata-ai-rw
           permission: write
@@ -925,25 +913,6 @@ categories:
         - name: docs-database-rw
           permission: write
       repository: docs/distributed-cache-service
-    - service_title: Distributed Database Middleware
-      service_type: ddm
-      docs:
-        - html_location: docs/ddm/api-ref
-          rst_location: api-ref/source
-          title: API Reference
-          type: api-ref
-          pdf_name: ddm-api-ref
-          hc_location: api/ddm
-        - html_location: docs/ddm/umn
-          rst_location: umn/source
-          title: User Guide
-          type: umn
-          pdf_name: ddm-umn
-          hc_location: usermanual/ddm
-      teams:
-        - name: docs-database-rw
-          permission: write
-      repository: docs/distributed-database-middleware
     - service_title: Document Database Service
       service_type: dds
       docs: