docs(README): remove extra indent (#702)

Author: jspoetry

README.md

@@ -428,7 +428,7 @@ app2.component('Bar', Bar) // equivalent to Vue.use('Bar', Bar)
 <details>
 <summary>
 ⚠️ <code>toRefs(props.foo)</code> will incorrectly warn when accessing nested levels of props. <br>
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;⚠️ <code>isReactive(props.foo)</code> will return false.
+&nbsp;&nbsp;&nbsp;&nbsp;⚠️ <code>isReactive(props.foo)</code> will return false.
 </summary>
 
 ```ts