docgen: expose WITH/WITHOUT HOLD syntax in SQL cursor diagram

Author: taroface

docs/generated/sql/bnf/declare_cursor_stmt.bnf

@@ -1,2 +1,4 @@
 declare_cursor_stmt ::=
-	'DECLARE' cursor_name opt_binary opt_sensitivity opt_scroll 'CURSOR' opt_hold 'FOR' select_stmt
+	'DECLARE' cursor_name opt_binary opt_sensitivity opt_scroll 'CURSOR' 'WITH' 'HOLD' 'FOR' select_stmt
+	| 'DECLARE' cursor_name opt_binary opt_sensitivity opt_scroll 'CURSOR' 'WITHOUT' 'HOLD' 'FOR' select_stmt
+	| 'DECLARE' cursor_name opt_binary opt_sensitivity opt_scroll 'CURSOR'  'FOR' select_stmt

pkg/cmd/docgen/diagrams.go

@@ -914,6 +914,10 @@ var specs = []stmtSpec{
 			"string_or_placeholder  'PASSWORD'": "name 'PASSWORD'",
 			"'PASSWORD' string_or_placeholder":  "'PASSWORD' password"},
 	},
+	{
+		name:   "declare_cursor_stmt",
+		inline: []string{"opt_hold"},
+	},
 	{
 		name: "default_value_column_level",
 		stmt: "stmt_block",