doc: fix comments in test-fs-watch.js

PR-URL: https://github.com/nodejs/node/pull/41046
Reviewed-By: Mohammed Keyvanzadeh <mohammadkeyvanzade94@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

test/parallel/test-fs-watch.js

@@ -22,14 +22,14 @@ class WatchTestCase {
 }
 
 const cases = [
-  // Watch on a directory should callback with a filename on supported systems
+  // Watch on a file should callback with a filename on supported systems
   new WatchTestCase(
     common.isLinux || common.isOSX || common.isWindows || common.isAIX,
     'watch1',
     'foo',
     'filePath'
   ),
-  // Watch on a file should callback with a filename on supported systems
+  // Watch on a directory should callback with a filename on supported systems
   new WatchTestCase(
     common.isLinux || common.isOSX || common.isWindows,
     'watch2',