Update copy.xml

reference/phar/PharData/copy.xml

@@ -84,7 +84,7 @@ try {
 }
 
 // the stream wrapper equivalent of the above code.
-// E_WARNINGS are triggered on error rather than exceptions.
+// E_WARNING are triggered on error rather than exceptions.
 copy('phar://myphar.tar/a', 'phar//myphar.tar/c');
 echo file_get_contents('phar://myphar.tar/c'); // outputs "hi"
 ?>