docs: update the sample

[mrwormhole]

Signed-off-by: F. Talha Altinel talhaaltinel@hotmail.com

Description

did an update on the docs, removed ioutil usage

How Has This Been Tested?

How are existing users impacted? What migration steps/scripts do we need?

N/A

Checklist:

I have:

• [X] updated the documentation and/or roadmap (if required)
• [X] read the CONTRIBUTION guide
• [X] signed-off my commits with git commit -s
• [ ] added unit tests

[mrwormhole]

@alexellis I did a similar one but for a different repository, just to keep you informed https://github.com/openfaas/templates/pull/295