Remove trailing whitespace.

writing-docs/STYLEGUIDE.md

@@ -122,7 +122,7 @@ available in.
 
 ## Use of HTML
 
-Generally, Pod 6 should be more than enough for any documentation. However, if you need to embed HTML into the documentation after thinking it twice,  bear in mind that we support the current and previous major releases of Chrome, Firefox, 
+Generally, Pod 6 should be more than enough for any documentation. However, if you need to embed HTML into the documentation after thinking it twice,  bear in mind that we support the current and previous major releases of Chrome, Firefox,
 Internet Explorer (Edge), and Safari. Please test layout changes.
 Lacking actual browsers to test in, you can use [browsershots.org](http://browsershots.org)
 or [browserstack.com](http://browserstack.com). Ensure the layout looks OK on mobile.