Fix incorrect paren in Html Entities code block

- Swap paren to `)` instead of `(`
- Editor also removed trailing whitespaces.

docs/mithril.md

@@ -245,7 +245,7 @@ m("div", "&times;") //becomes <div>&amp;times;</div>
 You can unescape trusted HTML strings by using [`m.trust`](mithril.trust.md)
 
 ```javascript
-m("div", m.trust("&times;"() //becomes <div>&times;</div>
+m("div", m.trust("&times;")) //becomes <div>&times;</div>
 ```
 
 ---
@@ -577,4 +577,3 @@ where:
 -	**returns** VirtualElement
 
 	The returned VirtualElement is a Javascript data structure that represents the DOM element to be rendered by [`m.render`](mithril.render.md)
-