Update src/ast/query.rs

Author: xitep

src/ast/query.rs

@@ -480,7 +480,7 @@ pub struct Select {
     pub prewhere: Option<Expr>,
     /// WHERE
     pub selection: Option<Expr>,
-    /// START WITH .. CONNECT BY
+    /// [START WITH ..] CONNECT BY ..
     pub connect_by: Option<ConnectBy>,
     /// GROUP BY
     pub group_by: GroupByExpr,