Fix ValueObservation.publisher documentation

Author: groue

Documentation/Combine.md

@@ -227,7 +227,7 @@ This publisher has the same behavior as ValueObservation:
 - It notifies an initial value before the eventual changes.
 - It may coalesce subsequent changes into a single notification.
 - It may notify consecutive identical values. You can filter out the undesired duplicates with the `removeDuplicates()` Combine operator, but we suggest you have a look at the [removeDuplicates()](../README.md#valueobservationremoveduplicates) GRDB operator also.
-- It stops emitting any value after the database connection is closed. But it never completes.
+- It only completes when it is cancelled.
 - By default, it notifies the initial value, as well as eventual changes and errors, on the main thread, asynchronously.
 
     This can be configured with the `scheduling` argument. It does not accept a Combine scheduler, but a [ValueObservation scheduler](../README.md#valueobservation-scheduling).