Add CS_IGNORE_UNFIXED to Container Scanning docs
What does this MR do and why?
Updates documentation for change introduced in gitlab-org/security-products/analyzers/container-scanning!2650 (merged)
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
-
I have evaluated the MR acceptance checklist for this MR.
Related to #338554 (closed)