[whatwg] Typo in section 4.6.2 Application Caches

[Anders Carlsson]

The text:

A browsing context can be associated with an application cache. A  
child browsing context is always associated with the same browsing  
context as its parent browsing context, if any.

should be:

A browsing context can be associated with an application cache. A  
child browsing context is always associated with the same *application  
cache* as its parent browsing context, if any.

Anders