fix: warning on Autocomplete

src/Autocomplete/doc/index.rst

@@ -290,7 +290,7 @@ Passing Extra Options to the Ajax-powered Autocomplete
 Autocomplete field options are not preserved when the field is rendered on an Ajax call. So, features like exclude some options
 based on the current form data are not possible by default. To partially avoid this limitation, the `extra_options` option was added.
 
-::warning
+.. warning::
 
     Only scalar values (`string`, `integer`, `float`, `boolean`), `null` and `arrays` (consisted from the same types as mentioned before) can be passed as extra options.