[Testing] Update nullable types #19786
Merged
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The Symfony codebase as been recently updated to replace implicit nullable types with explicit ones, but i think the code shown in documentation (method signatures or examples) has not been updated at the same time.
This PR is just a small "example" of what's to be updated on the Testing page
How do you think we should handle this ?
Create a "meta-issue" and split the work by component ?