doc: clarify conditional exports guidance
This updates the conditional exports examples to split on the "node"
and "default"
conditions over encouraging a "browser"
and "default"
split by default.
The notes are also updated to provide this guidance that a "default"
fallback as the more universal style code is a recommended pattern to ensure package forward compatibility in JS workflows.
Wording adjustments welcome.
//cc @nodejs/modules-active-members
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines