doc: mention N-API as recommended approach
We've had a few comments that from the doc it might not be clear that N-API is the recommended approach for Addons. As a start, mention N-API early in the non N-API section as the recommended approach unless lower level access is required.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines