Update 全文搜索可达层级

Author: Snailclimb

docs/index.html

@@ -26,7 +26,7 @@
 		placeholder: '搜索',
 		noData: '找不到结果',
 		// Headline depth, 1 - 6
-		depth: 2
+		depth: 3
         },
 
     }