Bug 22965: fixes typo on classification sources description on admin homepage

Bug 22965: fixes typo on classification sources description on admin homepage

Removed comma from description.

Test plan:
1. Go to Admin homepage
2. Check Classification Sources description
3. Verify that comma after i.e. has gone removed

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit b67462d471a54bf342295cbc5e46373d065bab7e)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>