Merge branch 'doc/analyzer-report-validation' into 'master'

Add section on schema compatibility

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/169216



Merged-by: Lucas Charles <me@lucascharles.me>
Approved-by: Lucas Charles <me@lucascharles.me>
Co-authored-by: Thiago Figueiró <tfigueiro@gitlab.com>