doc: fix profile type of --heap-prof-name

V8 CPU profile -> V8 heap profile

PR-URL: https://github.com/nodejs/node/pull/32404


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>