fix typo

Author: kevindees

v5/utilities.md

@@ -725,15 +725,15 @@ The `Str::quiet()` method checks if a value is `null` or a string that is blank
 use \TypeRocket\Utility\Str;
 
 Str::quiet(''); 
-// false
+// true
 
 Str::quiet(' ');
 // true
 
 Str::quiet(null); 
 // true
 
-Str::quiet(0); 
+Str::quiet('0'); 
 // false
 ```