docs: link to max duration vercel docs

[sacrosanctic]

https://vercel.com/changelog/serverless-functions-can-now-run-up-to-5-minutes

pro plans are now 300 seconds

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[ghostdevv]

Based on the blog post you linked it doesn't look like they changed the default for pro to 300 seconds.

[sacrosanctic]

my bad, would you like to add a range for max duration or simply close the issue?