Bug 23954: Format notes in suggestion management

Bug 23954: Format notes in suggestion management

This patch makes minor CSS and markup changes in order to deliniate
suggestion notes from the other data in the suggestions list view.

To test you should have at least one suggestion with a note. Apply the
patch and go to Acquisitions -> Suggestions.

In the table of suggestions, check that the notes display clearly.

Signed-off-by: Séverine QUEUNE <severine.queune@bulac.fr>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>