doc: clearer doc-only deprecations
Explicitely mention that a documentation only deprecation does not always imply that it will be staged for deprecation in a future Node.js major release. It is mainly there to tell developers that a specific API should be avoided.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines