Merge branch 'jy-duo-glossary' into 'master'

Add Duo glossary of terms

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/135073



Merged-by: Jessie Young <jessieyoung@gitlab.com>
Approved-by: Gosia Ksionek <mksionek@gitlab.com>
Approved-by: Eulyeon Ko <5961404-euko@users.noreply.gitlab.com>
Reviewed-by: Gosia Ksionek <mksionek@gitlab.com>
Reviewed-by: Eulyeon Ko <5961404-euko@users.noreply.gitlab.com>