feat: updating the example in read-dir

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description: Results of running static analysis checks when committing changes.
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---

Author: DivyanshuVortex

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

@@ -32,7 +32,7 @@ out = readDir.sync( 'beepboop' );
 // returns <Error>
 
 console.log( out instanceof Error );
-// => true
+// => false
 
 /* Async */