fix: Fix comment about sidecar (#1053)

## Description:
Just changing the wording of an error message to reflect what Kurtosis
is actually doing.

## Is this change user facing?
NO
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<!-- If yes, don't forget to include docs changes where relevant -->

## References (if applicable):
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information. -->

core/server/api_container/server/service_network/default_service_network.go

@@ -1446,15 +1446,15 @@ func (network *DefaultServiceNetwork) destroyService(ctx context.Context, servic
 	}
 	successfullyDestroyedUuids, failedToDestroyUuids, err := network.kurtosisBackend.DestroyUserServices(context.Background(), network.enclaveUuid, userServiceFilters)
 	if err != nil {
-		return stacktrace.Propagate(err, "Attempted to destroy the services with UUID '%v' but had no success. You must manually destroy the services. Kurtosis will now try to remove its sidecar if it exists but might it fail as well.", serviceUuid)
+		return stacktrace.Propagate(err, "Attempted to destroy the service with UUID '%v' but had no success. You must manually destroy the service as well as its sidecar if any", serviceUuid)
 	}
 	if _, found := successfullyDestroyedUuids[serviceUuid]; found {
 		if len(failedToDestroyUuids) != 0 {
 			return stacktrace.NewError("Service '%s' was successfully destroyed but unexpected error were returned by Kurtosis backend. This is unexpected and should be investigated. Here are the errors:\n%v", serviceUuid, failedToDestroyUuids)
 		}
 	} else {
 		if failedToDestroyErr, found := failedToDestroyUuids[serviceUuid]; found {
-			return stacktrace.Propagate(failedToDestroyErr, "Attempted to destroy the services with UUID '%v' but had no success. You must manually destroy the services. Kurtosis will now try to remove its sidecar if it exists but might it fail as well.", serviceUuid)
+			return stacktrace.Propagate(failedToDestroyErr, "Attempted to destroy the service with UUID '%v' but had no success. You must manually destroy the service as well as its sidecar if any", serviceUuid)
 		} else {
 			return stacktrace.NewError("Attempted to destroy service '%s' but it was neither marked as successfully destroyed nor errored in the result. This is a Kurtosis bug", serviceUuid)
 		}