docs: replace a wrong period with a comma

[valentincostam]

Summary

There is a period where a comma should be.

[rnwst]

@valentincostam I was just about to submit a PR for this as well haha.
Before this is merged you will likely be asked to correct the error in website/versioned_docs/version-* as well (this just happened to me). To do so, you can simply run

sed -i 's/Since `jest.spyOn` is a mock. You/Since `jest.spyOn` is a mock, you/' */*.md

inside of the versioned_docs directory.

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[SimenB]

thanks!

[SimenB]

@valentincostam could you sign the CLA?

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