Fix sample code for Timeout overload

The overload takes a `Func<TimeSpan>`, and it is assumed that we already have a lambda variable called `myTimeoutProvider, but the variable is incorrectly passed to the overload.

README.md

@@ -619,7 +619,7 @@ Policy
 
 // Configure variable timeout via a func provider.
 Policy
-  .Timeout(() => myTimeoutProvider)) // Func<TimeSpan> myTimeoutProvider
+  .Timeout(myTimeoutProvider)) // Func<TimeSpan> myTimeoutProvider
 
 // Timeout, calling an action if the action times out
 Policy