[Fix] Fix docs generation when two services have the same name (#872)

## What changes are proposed in this pull request?

Fix docs generation when two services have the same name. Currently,
only one service docs will be generated.

## How is this tested?

Regenerated current Docs

docs/gen-client-docs.py

@@ -267,11 +267,22 @@ def _load_mapping(self) -> dict[str, Tag]:
         pkgs = {p.name: p for p in self.packages}
         spec = json.loads(self._openapi_spec())
         for tag in spec['tags']:
+            is_account=tag.get('x-databricks-is-accounts')
+            # Unique identifier for the tag. Note that the service name may not be unique
+            key = 'a' if is_account else 'w'
+            parent_service = tag.get('x-databricks-parent-service')
+            if parent_service:
+                # SDK generation removes the "account" prefix from account services
+                clean_parent_service = parent_service.lower().removeprefix("account")
+                key = f"{key}.{clean_parent_service}"
+
+            key = f"{key}.{tag['x-databricks-service']}".lower()
+
             t = Tag(name=tag['name'],
                     service=tag['x-databricks-service'],
                     is_account=tag.get('x-databricks-is-accounts', False),
                     package=pkgs[tag['x-databricks-package']])
-            mapping[tag['name']] = t
+            mapping[key] = t
         return mapping
 
     @staticmethod
@@ -360,7 +371,7 @@ def service_docs(self, client_inst, client_prefix: str) -> list[ServiceDoc]:
                            service_name=service_name,
                            class_name=class_name,
                            doc=class_doc,
-                           tag=self._get_tag_name(service_inst.__class__.__name__, service_name),
+                           tag=self._get_tag_name(service_inst.__class__.__name__, client_prefix, service_name),
                            methods=self.class_methods(service_inst),
                            property=self.class_properties(service_inst)))
         return all
@@ -399,13 +410,13 @@ def write_dataclass_docs(self):
    
    {all}''')
 
-    def _get_tag_name(self, class_name, service_name) -> Tag:
+    def _get_tag_name(self, class_name, client_prefix, service_name) -> Tag:
         if class_name[-3:] == 'Ext':
             # ClustersExt, DbfsExt, WorkspaceExt, but not ExternalLocations
             class_name = class_name.replace('Ext', 'API')
         class_name = class_name[:-3]
-        for tag_name, t in self.mapping.items():
-            if t.service.lower() == str(class_name).lower():
+        for key, t in self.mapping.items(): 
+            if key == f'{client_prefix}.{str(class_name).lower()}':
                 return t
         raise KeyError(f'Cannot find {class_name} / {service_name} tag')