ruff

d296f602 - [red-knot] Merge Markdown code blocks inside a single section (#15950)

[red-knot] Merge Markdown code blocks inside a single section (#15950) ## Summary Allow for literate style in Markdown tests and merge multiple (unnamed) code blocks into a single embedded file. closes #15941 ## Test Plan - Interactively made sure that error-lines were reported correctly in multi-snippet sections.