Set string to string[] when is not necessary in jest addon documentation

[silversonicaxel]

Set to string when string[] is not necessary

Issue:

What I did

Improved documentation

How to test

• Is this testable with Jest or Chromatic screenshots?
• Does this need a new example in the kitchen sink apps?
• Does this need an update to the documentation?

If your answer is yes to any of these, please make sure to include it in your PR.

[nx-cloud]

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• nx run-many --target=prepare --all --parallel --max-parallel=15

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[silversonicaxel]

as @kylegach suggested here #16965 (comment) , I recreated my PR due to some previous conflicts.

[kylegach]

Thanks! Looks good!