Update nesh-cache.mdx

[jeltehomminga]

Found out this should be seconds, not milliseconds. It also influence the expireAge. So we saw with what we thought were 10 minutes in milliseconds become expire age of a week. changing 600000 to 600 to use 10 minutes fixed this issue.

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Latest commit: 5778f47423795fba75edfd2dab2747b5fcbaea21

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[better-salmon]

@jeltehomminga thank you for contribution!