Removed misleading text about describe() grouping tests into a test suite

[urig]

Summary

As reported and confirmed in #7412, describe() does not:

groups together several related tests in one "test suite".

Rather, every test file is considered a single "test suite" regardless of how many top-level calls to `describe() it contains.

This bit of documentation is misleading to some users (ex: StackOverflow question).

This PR makes the documentation more accurate, reducing user confusion.

Test plan

Preview the change in GitHub, demonstrating contents and markdown are correct.

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[SimenB]

@urig mind updating the versioned docs as well?

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[urig]

@urig mind updating the versioned docs as well?

Will do. 👍

[urig]

@SimenB Done. Please note that I've also updated the comment for describe() in flow-typed/npm/jest_v23.x.x.js.

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