[v6.x backport] doc: add callback function signatures in fs.md (!16306) · Merge requests · Rodrigo Test / Test Group-nodejs / node · GitLab

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Rodrigo Muino Tomonari requested to merge github/fork/matejkrajcovic/backport-13424-to-v6.0 into v6.x-staging Oct 18, 2017

Backport of #13424.

Checklist

documentation is changed or added
commit message follows commit guidelines

Affected core subsystem(s)

doc, fs