Allow doctool to fallback to use local files if not building a release build. Backport-PR-URL: https://github.com/nodejs/node/pull/32642 PR-URL: https://github.com/nodejs/node/pull/30214 Fixes: https://github.com/nodejs/node/issues/29918 Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Gus Caplan <me@gus.host> Reviewed-By: Chengzhong Wu <legendecas@gmail.com> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
