Updating "JSX Gotchas" docs for Custom Attributes

Adds note that custom attributes are supported on custom elements.
SUpermin6u · Oct 21, 2015 · 29939b7 · 29939b7
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commit 29939b7
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diff --git a/docs/docs/02.3-jsx-gotchas.md b/docs/docs/02.3-jsx-gotchas.md
@@ -61,6 +61,12 @@ If you pass properties to native HTML elements that do not exist in the HTML spe
 <div data-custom-attribute="foo" />
 ```
 
+However, arbitrary attributes are supported on custom elements (those with a hyphen in the tag name or an `is="..."` attribute).
+
+```javascript
+<x-my-component custom-attribute="foo" />
+```
+
 [Web Accessibility](http://www.w3.org/WAI/intro/aria) attributes starting with `aria-` will be rendered properly.
 
 ```javascript