doc: change Node.js style to error-first style
We change the awkward "Node.js style callback" phrasing to the more informative "error-first style callback," which is more in line with its usage
Refs: https://github.com/nodejs/node/pull/17593#discussion_r155963767
Checklist
-
documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
doc