Need to mention that the nodejs/unit-http module version must match the unit version

[ac000]

There should also be a note on the docs (https://unit.nginx.org/installation/#node-js)
that the unit & unit-http module need matching version numbers.

Indeed, that vital bit of information does seem to be missing... (I'll open a unit-docs issue for it)

Originally posted by @ac000 in nginx/unit#1219 (comment)