Add hint: pdo_dsn.

Author: Maikuolan

assets/config.yml

@@ -7,7 +7,7 @@
 # License: GNU/GPLv2
 # @see LICENSE.txt
 #
-# This file: Configuration defaults file (last modified: 2022.03.30).
+# This file: Configuration defaults file (last modified: 2022.04.04).
 ##/
 
 core:
@@ -432,6 +432,7 @@ supplementary_cache_options:
  pdo_dsn:
   type: "string"
   default: "mysql:dbname=phpmussel;host=localhost;port=3306"
+  hints: "hints_pdo_dsn"
  pdo_username:
   type: "string"
   default: ""