Update index.html.erb

Author: dapi

app/views/grape_swagger_rails/application/index.html.erb

@@ -8,7 +8,7 @@
     <script type="text/javascript">
 	$(function () {
 	    window.swaggerUi = new SwaggerUi({
-                discoveryUrl:"/api/swagger_doc.json",
+                discoveryUrl:"/swagger_doc.json",
                 apiKey:"special-key",
                 dom_id:"swagger-ui-container",
                 supportHeaderParams: true,