fixes: PFS-2584
**Test Plan
1. create new appt. group
2. as student reserve a slot in the appt. group
3. enter comments for the appt. and save
4. validate that on appt. popup it shows entered comments
5. as teacher view the appt. group slot the student reserved
6. should show comments the student entered.
Change-Id: I6e20c16da1fcbf1555ac22c011b2bf7a5db8eb67
Reviewed-on: https://gerrit.instructure.com/63129
Tested-by: Jenkins
QA-Review: Adrian Russell <arussell@instructure.com>
Reviewed-by: Matthew Wheeler <mwheeler@instructure.com>
Product-Review: Peyton Craighill <pcraighill@instructure.com>
Brandon Broschinsky