GlobalAPI: clarify key path behavior

[ikonst]

Summary

Clarify why this doesn't work as expected

it.each([
  {
    err: new Error(),
  },
])("handles err.constructor.name", async () => {});

Test plan

n/a

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: ikonst / name: Ilya Priven (f0a755b, 2eb1a9f)

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[SimenB]

Thanks! Could you update all versions of this doc?