doc: correct note on behavior of stats.isDirectory

PR-URL: #50946
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: NReilingh

doc/api/fs.md

@@ -6932,8 +6932,9 @@ added: v0.1.10
 
 Returns `true` if the {fs.Stats} object describes a file system directory.
 
-If the {fs.Stats} object was obtained from [`fs.lstat()`][], this method will
-always return `false`. This is because [`fs.lstat()`][] returns information
+If the {fs.Stats} object was obtained from calling [`fs.lstat()`][] on a
+symbolic link which resolves to a directory, this method will return `false`.
+This is because [`fs.lstat()`][] returns information
 about a symbolic link itself and not the path it resolves to.
 
 #### `stats.isFIFO()`