fix: fixed indentation

Author: NataliaTepluhina

src/api/special-attributes.md

@@ -48,9 +48,9 @@
   <child-component :ref="(el) => child = el"></child-component>
   ```
 
-When used on elements/components with `v-for`, the registered reference will be an Array containing DOM nodes or component instances.
+  When used on elements/components with `v-for`, the registered reference will be an Array containing DOM nodes or component instances.
 
-An important note about the ref registration timing: because the refs themselves are created as a result of the render function, you cannot access them on the initial render - they don't exist yet! `$refs` is also non-reactive, therefore you should not attempt to use it in templates for data-binding.
+  An important note about the ref registration timing: because the refs themselves are created as a result of the render function, you cannot access them on the initial render - they don't exist yet! `$refs` is also non-reactive, therefore you should not attempt to use it in templates for data-binding.
 
 - **See also:** [Child Component Refs](../guide/component-template-refs.html)