Merge branch 'jerasmus-improve-ai-dev-docs' into 'master'

Update AI development docs

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/144323



Merged-by: Denys Mishunov <dmishunov@gitlab.com>
Approved-by: Denys Mishunov <dmishunov@gitlab.com>
Co-authored-by: Jacques Erasmus <jerasmus@gitlab.com>