doc: adds assert doc for strict mode with pointer to strict equality
Adds a note to not confuse strict mode in assert
module with JS "use strict"
directive.
Refs: https://github.com/nodejs/node/issues/30485
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines