LPS-42673 Suffix description fields id to make them unique. (Please, ping me when you get to this if necessary)

Hey Brian, I'm resending this PR as originally after discussing it with @juliocamarero.

We're following the same pattern as in https://github.com/liferay/liferay-portal/blob/master/portal-web/docroot/html/portal/layout/edit/panel.jsp#L33, since we just need to differentiate between some elements, and not a random number of them.

Please, ping me if you have any questions.

Thanks!