This feels like it should be simple to do, but I can't work it out.
If I have a text field, how do I rewrite the output of the field on the "Manage display" tab of the content type? For example, I might want to add units, or convert a product ID into a link to an external website.
I know how to do this stuff in Views, but it would seem to make sense to be able to do it via the "Manage Display" tab for a content type. Am I missing something?