doc: add missing events.on metadata · nodejs/node@8792c7c

doc: add missing events.on metadata

This was missed in the original PR. Refs: #34912 PR-URL: #37965 Reviewed-By: Michaël Zasso <targos@protonmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Darshan Sen <raisinten@gmail.com> Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>

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