Ability names are confusing

Everyone can contribute. Help move this issue forward while earning points, leveling up and collecting rewards.

See:

It's really hard to keep track of the difference between admin_* and update_*, and we've got inconsistencies, where :admin_project_member and :admin_group_member need the project/group as their object, while :update_group_member and :destroy_group_member need the actual GroupMember.

cc @rspeicher @dzaporozhets

Edited by 🤖 GitLab Bot 🤖