doc: fix corepack grammar for `--force` flag

PR-URL: https://github.com/nodejs/node/pull/40762


Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com>
Reviewed-By: Voltrex <mohammadkeyvanzade94@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>