Rename operation schema files to operation files for consistency

Author: ana-demags

docs/source/quickstart.mdx

@@ -181,7 +181,7 @@ If you're still having issues:
 ## Next Steps
 
 See the [user guide](/apollo-mcp-server/guides) to learn how to create tools from:
-- [Operation schema files](/apollo-mcp-server/guides#from-operation-files)
+- [Operation files](/apollo-mcp-server/guides#from-operation-files)
 - [Persisted query manifests](/apollo-mcp-server/guides/#from-persisted-query-manifests)
 - [Schema introspection](/apollo-mcp-server/guides/#from-schema-introspection)