doc: clarify some default values in fs.md#42892

Merged

aduh95 merged 3 commits intonodejs:masterfrom

LiviaMedeiros:doc-fs-defaults

May 2, 2022

Commits on Apr 28, 2022

doc: clarify some default values in fs.md
LiviaMedeiros
committed

Commits on Apr 29, 2022

squash: declare some values as nullable in fs.js
LiviaMedeiros
committed

Commits on Apr 30, 2022

squash: document position in fs.readSync as optional
LiviaMedeiros
committed