src: add NODE_NO_WARNINGS to --help output
This commit adds a description of the NODE_NO_WARNINGS
environment variable to the --help
output. This was overlooked in 49902124.
Refs: https://github.com/nodejs/node/pull/10842
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
src