Update timestamp details for On Call API (#3072)

Co-authored-by: ci.datadog-api-spec <packages@datadoghq.com>

Author: api-clients-generation-pipeline[bot]

.generator/schemas/v2/openapi.yaml

@@ -79176,8 +79176,10 @@ paths:
         schema:
           example: 3653d3c6-0c75-11ea-ad28-fb5701eabc7d
           type: string
-      - description: Retrieves the on-call user at the given timestamp (ISO-8601).
-          Defaults to the current time if omitted."
+      - description: Retrieves the on-call user at the given timestamp in RFC3339
+          format (for example, `2025-05-07T02:53:01Z` or `2025-05-07T02:53:01+00:00`).
+          When using timezone offsets with `+` or `-`, ensure proper URL encoding
+          (`+` should be encoded as `%2B`). Defaults to the current time if omitted.
         in: query
         name: filter[at_ts]
         schema:

src/datadog_api_client/v2/api/on_call_api.py

@@ -889,7 +889,7 @@ def get_schedule_on_call_user(
         :type schedule_id: str
         :param include: Specifies related resources to include in the response as a comma-separated list. Allowed value: ``user``.
         :type include: str, optional
-        :param filter_at_ts: Retrieves the on-call user at the given timestamp (ISO-8601). Defaults to the current time if omitted."
+        :param filter_at_ts: Retrieves the on-call user at the given timestamp in RFC3339 format (for example, ``2025-05-07T02:53:01Z`` or ``2025-05-07T02:53:01+00:00`` ). When using timezone offsets with ``+`` or ``-`` , ensure proper URL encoding ( ``+`` should be encoded as ``%2B`` ). Defaults to the current time if omitted.
         :type filter_at_ts: str, optional
         :rtype: Shift
         """