You should be able to edit them by clicking the edit link. However, in our installation that doesn’t work and throws and “Undefined index: edit_options” error, and “Undefined index: form_id” error ( in the apache2 log at var/log/apache2/error.log), so the link option does nothing.
Seems that it needs some working on. I don’t know what version you use, maybe in your version it works.
But you can edit the short descriptions directly in the “codes” table of OpenEMR. Be careful what you type. You can do it with phpMyAdmin if that is activated in the global settings. Or install it on your machine…