Removes advice not to mix p/c with compliance pipes

Merged Max Woolf requested to merge mw/parent-child-pipelines-compliance into master

What does this MR do and why?

In 14.8 we added support for parent/child pipelines being used at the same time as a compliance pipeline configuration. Previously the documentation suggested to avoid mixing these two but now that is no longer the case.

This MR removes the section from the documentation with this warning.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.