update description for seed option

[jzaefferer]

Add details on how the seed, specified or not, is used by Jest internally.

Summary

Fixes docs issue described in #15060

Test plan

n/a, since this only updates docs

[linux-foundation-easycla[bot]]

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• :white_check_mark: login: jzaefferer / name: Jörn Zaefferer (cfbf3f38316231cc827b9efb8148df8757dea7ca)

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[SimenB]

Thanks! Could you update the versioned docs as well? It was added in 29.2, so it should be in all of them

[jzaefferer]

Ah, alright! That also explains why I didn't see the change in the deploy preview. I had to switch to "next" to see it.

[jzaefferer]

This is better:

next: https://deploy-preview-15266--jestjs.netlify.app/docs/next/cli#--seednum

29.7: https://deploy-preview-15266--jestjs.netlify.app/docs/cli#--seednum

[jzaefferer]

So I adjusted all 4 relevant versioned docs and the previews looks good. Is there something else I can do?

[jzaefferer]

The issue was closed as stale by a bot. I'm not going to bother cloning it just to have an open issue.

As far as I can tell this PR is good to merge. It only changes documentation, so should be very low risk.

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