doc: edit N-API introductory material in Collaborator Guide
Use shorter, clearer sentences. Remove passive voice and personal pronouns.
Review from @nodejs/n-api would be appreciated. I especially want to make sure this sentence is correct: "Existing N-API APIs cannot change or disappear, even in semver-major releases." Is that always true or merely often true?
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines