Comment 3 for bug 1492081

The keyboard controls for select2 are still ... unusual, so some explanation probably needs to be added to the user manual. Basically:

- To open the selection dropdown, focus on the combo box and press Enter twice. Screen reader users should hear "Please enter 1 or more characters"
- Use the arrow keys to select an option, then press Enter to add it to the list of selected items. A "Remove" button for that item will then appear above the input box