deskutils/xfce4-tumbler: Update pkg-message
- Add note about thubmnailer plugins
- Update referenced URL for further information
PR: 273697
Reviewed by: Anton Saietskii <vsasjason@gmail.com>
MFH: 2023Q3
(cherry picked from commit c9cb2f0d1fbd1d1c62f5a69078e763788a80bd94)