chore: fix JavaScript lint errors (issue #8483)

Author: Ankit-Trivedi-02

lib/node_modules/@stdlib/fs/read-dir/examples/index.js

@@ -26,7 +26,7 @@ var out = readDir.sync( __dirname );
 // returns <Array>
 
 console.log( out instanceof Error );
-// => false
+// => true
 
 out = readDir.sync( 'beepboop' );
 // returns <Error>