lets you specify a help string for each attribute, but it is up to you to use it in your customization. This string is stored in the dm_nls_dd_info as help_text field (if you query the database using SQL the table is called more precisely “dm_nls_dd_info_s”).
Having the type name and attribute name, your custom application/component can retrieve this string from the docbase and display it to the user in a way you find more suitable.