fix formatting

README.md

@@ -261,7 +261,7 @@ This will add or remove the `disabled` attribute when `myVar` is true or false r
 
 Boolean attributes are supported as per the [HTML specification](https://html.spec.whatwg.org/multipage/indices.html#attributes-3:boolean-attribute), for example `disabled`, `readonly`, `required`, `checked`, `hidden`, `selected`, `open` etc.
 
-**`x-bind` with `null` to denote attribute removal
+**`x-bind` with `null` to denote attribute removal**
 
 For attributes that aren't standard boolean attributes (per the HTML spec, see previous section). It's still possible to mark the attribute for _removal_ when it gets passed `null`. This is in contrast to the regular behaviour where the attribute is set to whatever value it's bound to (even falsy values `false`, `undefined`, `0` etc).