fs.Stats properties are not documented

### Affected URL(s)

https://nodejs.org/api/fs.html#class-fsstats

### Description of the problem

`fs.Stats` doc gives an example of returned value but properties are not documented.

I'm not sure of the meaning of properties `dev`, `mode`, `nlink`, `uid`, `gid`, `rdev`...
What is the difference between `ctime` and `birthtime`?

`fs.Stats` properties should be documented.