Merge pull request #8638 from brnv/master

File upload docs fix.

docs/guide/input-file-upload.md

@@ -35,7 +35,7 @@ class UploadForm extends Model
     public function upload()
     {
         if ($this->validate()) {
-            $this->imageFile->saveAs('uploads/' . $model->imageFile->baseName . '.' . $model->imageFile->extension);
+            $this->imageFile->saveAs('uploads/' . $this->imageFile->baseName . '.' . $this->imageFile->extension);
             return true;
         } else {
             return false;