Fix typo in --shard docs

[helloitsjoe]

Summary

Fixes a typo in the --shard CLI docs on the jestjs.io website

Test plan

(No tests, documentation only)

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[SimenB]

thanks!

can you do https://github.com/facebook/jest/blob/27eb77e86f388ee88fd3badb7ce6e872d82405ad/website/versioned_docs/version-28.0/CLI.md as well?

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[helloitsjoe]

@SimenB Sure thing!

[SimenB]

thanks!

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