doc: remove non-existent entry-type flag

PR-URL: https://github.com/nodejs/node/pull/27678


Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Guy Bedford <guybedford@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>