ZF-11578: s/dir_exists/file_exists/

- Fix two examples in the Dojo BuildLayer docs to use file_exists

git-svn-id: http://framework.zend.com/svn/framework/standard/trunk@24285 44c647ce-9c0f-0410-b52a-842ac1e357ba

documentation/manual/en/module_specs/Zend_Dojo-BuildLayers.xml

@@ -104,7 +104,7 @@ $build = new Zend_Dojo_BuildLayer(array(
 
 $layerContents = $build->generateLayerScript();
 $filename      = APPLICATION_PATH . '/../public/js/custom/main.js';
-if (!dir_exists(dirname($filename))) {
+if (!file_exists(dirname($filename))) {
     mkdir(dirname($filename));
 }
 file_put_contents($filename, $layerContents);
@@ -150,7 +150,7 @@ class App_Plugin_DojoLayer extends Zend_Controller_Plugin_Abstract
     {
         $build = $this->getBuild();
         $layerContents = $build->generateLayerScript();
-        if (!dir_exists(dirname($this->layerScript))) {
+        if (!file_exists(dirname($this->layerScript))) {
             mkdir(dirname($this->layerScript));
         }
         file_put_contents($this->layerScript, $layerContents);