doc: replace _WG_ with _team_

AFAICT, there is no N-API Working Group. There *is* an N-API team, but
AFAIK there is no charter etc. (And if I'm wrong and there is, then
https://nodejs.org/en/about/working-groups/ needs an update!)

PR-URL: https://github.com/nodejs/node/pull/22183


Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>