[v14.x backport] doc: update `buffer.constants.MAX_LENGTH`
Fixes: https://github.com/nodejs/node/issues/38093
PR-URL: https://github.com/nodejs/node/pull/38109 Reviewed-By: Darshan Sen raisinten@gmail.com Reviewed-By: Antoine du Hamel duhamelantoine1995@gmail.com Reviewed-By: James M Snell jasnell@gmail.com