pubsub: add EXPERIMENTAL notice to ExpirationPolicy
Post-merge updates suggested by Jean, from CL 40772.
@@ -152,9 +152,8 @@ type SubscriptionConfig struct {
// operations on the subscription. If `expiration_policy` is not set, a
// *default policy* with `ttl` of 31 days will be used. The minimum allowed
// value for `expiration_policy.ttl` is 1 day.
- // BETA: This feature is part of a beta release. This API might be
- // changed in backward-incompatible ways and is not recommended for production
- // use. It is not subject to any SLA or deprecation policy.
+ //
+ // It is EXPERIMENTAL and subject to change or removal without notice.
ExpirationPolicy time.Duration
// The set of labels for the subscription.
