Module tutorial needs updating

[chriswyatt1]

Is your feature request related to a problem? Please describe

https://nf-co.re/docs/contributing/tutorials/dsl2_modules_tutorial

Current document shows old practises :

e.g.

// Import generic module functions
include { initOptions; saveFiles; getSoftwareName } from './functions'

params.options = [:]
options        = initOptions(params.options)

Which gets an error with linting. Same with publishDir etc which I don't see in the recently made modules.

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