add note acbout breaking change (#21906)

docs/integrations/sources/sendgrid.md

@@ -78,7 +78,7 @@ The connector is restricted by normal Sendgrid [requests limitation](https://sen
 
 | Version | Date       | Pull Request                                             | Subject                                               |
 |:--------|:-----------|:---------------------------------------------------------|:------------------------------------------------------|
-| 0.3.0  | 2023-01-25 | [21587](https://github.com/airbytehq/airbyte/pull/21587) | Make sure spec works as expected in UI - make starttime parameter an ISO string instead of a timestamp                                                                          |
+| 0.3.0  | 2023-01-25 | [21587](https://github.com/airbytehq/airbyte/pull/21587) | Make sure spec works as expected in UI - make start_time parameter an ISO string instead of an integer interpreted as timestamp (breaking, update your existing connections and set the start_time parameter to ISO 8601 date time string in UTC)                                                                          |
 | 0.2.16  | 2022-11-02 | [18847](https://github.com/airbytehq/airbyte/pull/18847) | Skip the stream on `400, 401 - authorization required` with log message |
 | 0.2.15  | 2022-10-19 | [18182](https://github.com/airbytehq/airbyte/pull/18182) | Mark the sendgrid api key secret in the spec          |
 | 0.2.14  | 2022-09-07 | [16400](https://github.com/airbytehq/airbyte/pull/16400) | Change Start Time config parameter to datetime string |