Update README.md

Author: swhitty

README.md

@@ -40,7 +40,7 @@ let val = try await withThrowingTimeout(seconds: 2.0) {
 
 > Note: When the timeout expires the task executing the closure is cancelled and `TimeoutError` is thrown.
 
-An overload includes the `Timeout` object that allows the body to cancel or move the expiration if required:
+An overload includes a `Timeout` object allowing the body to cancel or move the expiration where required:
 
 ```swift
 try await withThrowingTimeout(seconds: 1.0) { timeout in