Update api-registry.md card title (#1315)

listing this as "API Registry" is confusing ("API Registry for what?!"), so adding "Google Cloud" to title

Author: joefernandez

docs/integrations/api-registry.md

@@ -1,6 +1,6 @@
 ---
-catalog_title: API Registry
-catalog_description: Dynamically connect with Google Cloud services as MCP tools
+catalog_title: Google Cloud API Registry
+catalog_description: Connect with Google Cloud services as MCP tools
 catalog_icon: /adk-docs/integrations/assets/developer-tools-color.svg
 catalog_tags: ["google", "mcp", "connectors"]
 ---