doc: specify unit of time passed to fs.utimes

PR-URL: #33230
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Anto Aravinth <[email protected]>
Reviewed-By: Masashi Hirano <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>
Reviewed-By: Juan José Arboleda <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>

Author: SimenB

doc/api/fs.md

@@ -3789,8 +3789,8 @@ Change the file system timestamps of the object referenced by `path`.
 
 The `atime` and `mtime` arguments follow these rules:
 
-* Values can be either numbers representing Unix epoch time, `Date`s, or a
-  numeric string like `'123456789.0'`.
+* Values can be either numbers representing Unix epoch time in seconds,
+  `Date`s, or a numeric string like `'123456789.0'`.
 * If the value can not be converted to a number, or is `NaN`, `Infinity` or
   `-Infinity`, an `Error` will be thrown.