Merge pull request #823 from fasterthanlime/patch-2

'because' typo in cancellation doc

docs/docs/api/cancellation.md

@@ -77,7 +77,7 @@ As shown in the example the handlers registered with `.finally` are called even
 
 ###What about promises that have multiple consumers?
 
-It is often said that promises cannot be cancellable beacuse they can have multiple consumers.
+It is often said that promises cannot be cancellable because they can have multiple consumers.
 
 For instance:
 
@@ -109,4 +109,4 @@ Note that it is an error to consume an already cancelled promise, doing such a t
         (document.getElementsByTagName("head")[0] || document.getElementsByTagName("body")[0]).appendChild(dsq);
     })();
 </script>
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