docs(query-syntax): frontmatter description names expand, not the removed joins

Author: claude

content/docs/protocol/objectql/query-syntax.mdx

@@ -1,7 +1,7 @@
 ---
 title: ObjectQL query syntax — the full specification
 navTitle: Query Syntax
-description: Database-agnostic query language with filtering, joins, aggregations, and sorting — aligned with the canonical @objectstack/spec QuerySchema
+description: Database-agnostic query language with filtering, expand, aggregations, and sorting — aligned with the canonical @objectstack/spec QuerySchema
 ---
 
 import { Search, Filter, GitMerge, BarChart } from 'lucide-react';