doc: fix example

[zekth]

Currently the examples show how to write a simple server but also leads to a double log because of this line :

fastify/lib/server.js

Line 130 in ba43b31

this.log.info('Server listening at ' + address)

and this snippet:

fastify.listen(3000, (err, address) => {
  if (err) throw err
  fastify.log.info(`server listening on ${address}`) // This will be duplicated
})

In a sense it is good to show where to put logs when server starts but at the same time it will be strange as a first developer experience to see dupe log lines. I'm definitely not sure this is the best way to adress this problem but i think we should find a solution for this.

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

[RafaelGSS]

Indeed.

[mcollina]

lgtm

[github-actions]

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