doc: modernize and fix code examples in process.md
Checklist
-
documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
doc, process
- Replace
var
byconst
. - Use
console.error()
. - Fix example file name mismatch (compare with the previous example description).
- Update output examples.
- Increase output readability (add a line break, remove an unnecessary duplicate word).