docs(error/$rootScope/inprog): fix $timeout typo

Closes #8071

docs/content/error/$rootScope/inprog.ngdoc

@@ -161,7 +161,7 @@ In this second scenario, we are already inside a `$digest` when the ngFocus dire
 call to `$apply()`, causing this error to be thrown.
 
 It is possible to workaround this problem by moving the call to set the focus outside of the digest,
-by using `$timeOut(fn, 0, false)`, where the `false` value tells Angular not to wrap this `fn` in a
+by using `$timeout(fn, 0, false)`, where the `false` value tells Angular not to wrap this `fn` in a
 `$apply` block:
 
 ```