docs: As implied by #5517 make sure everything still builds on docs.rs #5535
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Description
As @guillaumemichel already found out, passing the
docsrs
cfg to rustc now breaks the documentation build. Although I couldn't exactly reproduce the docs.rs build env (everyone is welcome to try; it's explained here) it's safe to assume that the same problem will occur when we push to docs.rs.Passing the docsrs flag is also no longer required since it's now automatically passed to rustdoc when building on docs.rs. Explanation: https://docs.rs/about/builds#detecting-docsrs
Notes & open questions
None. (I'm pretty sure it will work on docs.rs)
Change checklist