What is the "compat" admonition in Documenter used for?

Sorry to be dumb, but what “compat” means in “Compat admonition” in Documenter ?
And now that I am trying to post… what’s the relation with the “compat” session in Project.toml ?

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Compatibility annotations, for example the note here: docs.julialang.org/en/v1/base/strings/#Base.isvalid.

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got it! thanks