doc: updated directory entry information

Fixes: #25595
subdirectory
updated def
PR-URL: #32791
Reviewed-By: Anna Henningsen <anna@addaleax.net>

Author: Eileen

doc/api/fs.md

@@ -430,8 +430,9 @@ included in the iteration results.
 added: v10.10.0
 -->
 
-A representation of a directory entry, as returned by reading from an
-[`fs.Dir`][].
+A representation of a directory entry, which can be a file or a subdirectory
+within the directory, as returned by reading from an [`fs.Dir`][]. The
+directory entry is a combination of the file name and file type pairs.
 
 Additionally, when [`fs.readdir()`][] or [`fs.readdirSync()`][] is called with
 the `withFileTypes` option set to `true`, the resulting array is filled with