Make some indentation in gram.y consistent

Reviewed-by: Amit Langote <amitlangote09@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/CA+HiwqE4XTdfb1nW=Ojoy_tQSRhYt-q_kb6i5d4xcKyrLC1Nbg@mail.gmail.com

src/backend/parser/gram.y

@@ -645,24 +645,21 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
 %type <list>		hash_partbound
 %type <defelt>		hash_partbound_elem
 
-
 %type <node>	json_format_clause_opt
 				json_value_expr
 				json_output_clause_opt
 				json_name_and_value
 				json_aggregate_func
-
 %type <list>	json_name_and_value_list
 				json_value_expr_list
 				json_array_aggregate_order_by_clause_opt
-
 %type <ival>	json_encoding_clause_opt
 				json_predicate_type_constraint
-
 %type <boolean>	json_key_uniqueness_constraint_opt
 				json_object_constructor_null_clause_opt
 				json_array_constructor_null_clause_opt
 
+
 /*
  * Non-keyword token types.  These are hard-wired into the "flex" lexer.
  * They must be listed first so that their numeric codes do not depend on