Fixing the titles for Gauss DB to match the names from current HC

otc_metadata/data/services.yaml

@@ -1285,7 +1285,7 @@ services:
         repo: opentelekomcloud-docs/gaussdb-mysql
         type: github
     service_category: database
-    service_title: GaussDB Enterprise-class Distributed Database compatible with MySQL
+    service_title: GaussDB(for MySQL)
     service_type: gaussdb_mysql
     teams:
       - name: docs-database-rw
@@ -1298,7 +1298,7 @@ services:
         repo: opentelekomcloud-docs/gaussdb-nosql
         type: github
     service_category: database
-    service_title: GaussDB Distributed Multi-model NoSQL Database
+    service_title: GaussDB NoSQL
     service_type: gaussdb_nosql
     teams:
       - name: docs-database-rw
@@ -1415,7 +1415,7 @@ services:
         repo: opentelekomcloud-docs/gaussdb-opengauss
         type: github
     service_category: database
-    service_title: GaussDB Enterprise-grade Relational Database on the openGauss ecosystem
+    service_title: GaussDB(openGauss)
     service_type: opengauss
     teams:
       - name: docs-database-rw