add prev/next buttons to 'Edit Column Documentation' dialog
When a user needs to edit the documentation of several columns in one sitting, it is tedious to have to open and close the Edit Column Documentation dialog separately for each column. This often takes more time than the actual edit itself. This could be solved by adding "prev" and "next" buttons for moving back and forth across columns (and making multiple edits) within a single instance of the Edit Column Documentation dialog.
Note that the Import Data table wizard already has buttons to go back and forth across columns, albeit with extra things at the beginning and end of the wizard.