docs: update docs for rich editor

Author: yaroslav8765

adminforth/documentation/docs/tutorial/07-Plugins/04-RichEditor.md

@@ -227,12 +227,7 @@ export default {
       filePath: ({ originalFilename, originalExtension, contentType }) =>
         `description_images/${new Date().getFullYear()}/${uuid()}/${originalFilename}.${originalExtension}`,
 
-      preview: {
-        // Used to display preview (if it is image) in list and show views instead of just path
-        // previewUrl: ({s3Path}) => `https://tmpbucket-adminforth.s3.eu-central-1.amazonaws.com/${s3Path}`,
-        // show image preview instead of path in list view
-        // showInList: false,
-      },
+
     }),
   ],
 } as AdminForthResourceInput;