Update modules/ROOT/pages/uploadcare.adoc

Co-authored-by: Farzad Hayat <[email protected]>

Author: kemister85

modules/ROOT/pages/uploadcare.adoc

@@ -38,7 +38,7 @@ For example:
 [source,js]
 ----
 tinymce.init({
-  selector: "textarea",
+  selector: 'textarea',
   plugins: 'uploadcare',
   toolbar: 'uploadcare',
   uploadcare_public_key: '<your-public-key>',