doc: add additional caveat for fs.watch

Add clarification based on discussion with security
researcher.

Signed-off-by: Michael Dawson <[email protected]>
PR-URL: #57150
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>

Author: mhdawson

doc/api/fs.md

@@ -4772,6 +4772,12 @@ unavailable in some situations.
 On Windows, no events will be emitted if the watched directory is moved or
 renamed. An `EPERM` error is reported when the watched directory is deleted.
 
+The `fs.watch` API does not provide any protection with respect
+to malicious actions on the file system. For example, on Windows it is
+implemented by monitoring changes in a directory versus specific files. This
+allows substitution of a file and fs reporting changes on the new file
+with the same filename.
+
 ##### Availability
 
 <!--type=misc-->