Fix MockFunctions example that was using toContain instead of toContainEqual

[felipepastorelima]

Summary

toContain won't work in the case of the example, because it will try to compare arrays with Object.is.

Test plan

Documentation update.

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[jeysal]

Thanks! Mind also updating this in website/versioned_docs for older versions? (and signing the CLA to make the bot happy :)

[felipepastorelima]

Done, thanks!

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