Proofread doc/user/group/index.md
What does this MR do?
This MR fixes doc errors while proofreading doc/user/group/index.md.
CC: @rpaik @dplanella
Edited by 🤖 GitLab Bot 🤖
This MR fixes doc errors while proofreading doc/user/group/index.md.
CC: @rpaik @dplanella