docs: Remove repeated text in Update GlobalAPI.md

[anbnyc]

Summary

This text is repeated twice on the API docs page https://jestjs.io/docs/api#describeeachtablename-fn-timeout

(only works for ["own" properties](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty), e.g. `$variable.constructor.name` wouldn't work)

Test plan

Run docs locally to confirm

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[SimenB]

good catch - thanks!

[SimenB]

Oh, do you mind signing the CLA?