postgres data-observability - sync instance.py with updated spec descriptions

Signed-off-by: mobuchowski <maciej.obuchowski@datadoghq.com>

Author: mobuchowski

postgres/datadog_checks/postgres/config_models/instance.py

@@ -142,13 +142,13 @@ class Query(BaseModel):
     entity: Entity
     interval_seconds: Optional[int] = Field(
         None,
-        description='How often (in seconds) to run this query. At least one of interval_seconds or\nschedule must be set. When both are present, schedule takes precedence and\ninterval_seconds is ignored.\n',
+        description='How often (in seconds) to run this query. When both schedule and\ninterval_seconds are present, schedule takes precedence and interval_seconds\nis ignored. If neither is set, the query is skipped at runtime with a warning.\n',
     )
     monitor_id: int
     query: str
     schedule: Optional[str] = Field(
         None,
-        description='A standard 5-field cron expression (minute hour dom month dow) specifying\nwhen to run this query. When set, takes precedence over interval_seconds.\nAt least one of schedule or interval_seconds must be set.\n',
+        description='A standard 5-field cron expression (minute hour dom month dow) specifying\nwhen to run this query. When set, takes precedence over interval_seconds.\nIf neither schedule nor interval_seconds is set, the query is skipped at\nruntime with a warning.\n',
     )
     type: Optional[str] = None