Clarify Automatic Check-Ins (Vercel Only) section in docs

[shanamatthews]

Core or SDK?

Platform/SDK

Which part? Which one?

Next.js SDK

Description

https://docs.sentry.io/platforms/javascript/guides/nextjs/crons/#automatic-check-ins-vercel-only

"I found the Automatic Check-Ins (Vercel Only) section quite confusing here.

When does Vercel automatically add check-ins? At runtime? Or does the Sentry install wizard modify all my route handlers?

Or is adding a cron to vercel.json all I need to do?"

Suggested Solution

Verify the docs on crons automatic checkins for next.js apps on vercel are correct.

Add additional clarification about how these checkins are added.

[getsantry]

Assigning to @getsentry/support for routing ⏲️

[getsantry]

Routing to @getsentry/product-owners-sdks-web-frontend for triage ⏲️