Add note to call out schedule_interval default (#2844)

* Add note to call out schedule_interval default

* Appease Vale

api/add_policies.md

@@ -31,6 +31,12 @@ timescaledb_experimental.add_policies(
 
 <Experimental />
 
+<Highlight type="note">
+`add_policies()` does not allow the `schedule_interval` for the continuous aggregate to be set, instead using a default value of 1 hour. 
+
+If you would like to set this add your policies manually (see [`add_continuous_aggregate_policy`][add_continuous_aggregate_policy]).
+</Highlight>
+
 ## Required arguments
 
 |Name|Type|Description|
@@ -74,3 +80,6 @@ SELECT timescaledb_experimental.add_policies(
     drop_after => '1 year'::interval
 );
 ```
+<!-- vale Vale.Terms = NO -->
+[add_continuous_aggregate_policy]: /api/:currentVersion/continuous-aggregates/add_continuous_aggregate_policy/
+<!-- vale Vale.Terms = YES -->