add context about updated_at support (#6746)

website/docs/docs/build/snapshots.md

@@ -80,7 +80,7 @@ The following table outlines the configurations available for snapshots:
 | [strategy](/reference/resource-configs/strategy) | The snapshot strategy to use. Valid values: `timestamp` or `check` | Yes | timestamp |
 | [unique_key](/reference/resource-configs/unique_key) | A <Term id="primary-key" /> column(s) (string or array) or expression for the record | Yes |  `id` or `[order_id, product_id]` |
 | [check_cols](/reference/resource-configs/check_cols) | If using the `check` strategy, then the columns to check | Only if using the `check` strategy | ["status"] |
-| [updated_at](/reference/resource-configs/updated_at) | If using the `timestamp` strategy, the timestamp column to compare | Only if using the `timestamp` strategy | updated_at |
+| [updated_at](/reference/resource-configs/updated_at) | A column in your snapshot query results that indicates when each record was last updated, used in the `timestamp` strategy. May support ISO date strings and unix epoch integers, depending on the data platform you use. | Only if using the `timestamp` strategy | updated_at |
 | [dbt_valid_to_current](/reference/resource-configs/dbt_valid_to_current) | Set a custom indicator for the value of `dbt_valid_to` in current snapshot records (like a future date). By default, this value is `NULL`. When configured, dbt will use the specified value instead of `NULL` for `dbt_valid_to` for current records in the snapshot table.| No | string |
 | [snapshot_meta_column_names](/reference/resource-configs/snapshot_meta_column_names) | Customize the names of the snapshot meta fields | No | dictionary |
 | [hard_deletes](/reference/resource-configs/hard-deletes) | Specify how to handle deleted rows from the source. Supported options are `ignore` (default), `invalidate` (replaces the legacy `invalidate_hard_deletes=true`), and `new_record`.| No | string |
@@ -237,7 +237,7 @@ The `timestamp` strategy requires the following configurations:
 
 | Config | Description | Example |
 | ------ | ----------- | ------- |
-| updated_at | A column which represents when the source row was last updated | `updated_at` |
+| updated_at | A column which represents when the source row was last updated. May support ISO date strings and unix epoch integers, depending on the data platform you use. | `updated_at` |
 
 **Example usage:**
 
@@ -586,7 +586,7 @@ The following table outlines the configurations available for snapshots in versi
 | [strategy](/reference/resource-configs/strategy) | The snapshot strategy to use. One of `timestamp` or `check` | Yes | timestamp |
 | [unique_key](/reference/resource-configs/unique_key) | A <Term id="primary-key" /> column or expression for the record | Yes | id |
 | [check_cols](/reference/resource-configs/check_cols) | If using the `check` strategy, then the columns to check | Only if using the `check` strategy | ["status"] |
-| [updated_at](/reference/resource-configs/updated_at) | If using the `timestamp` strategy, the timestamp column to compare | Only if using the `timestamp` strategy | updated_at |
+| [updated_at](/reference/resource-configs/updated_at) | A column in your snapshot query results that indicates when each record was last updated, used in the `timestamp` strategy. May support ISO date strings and unix epoch integers, depending on the data platform you use.  | Only if using the `timestamp` strategy | updated_at |
 | [invalidate_hard_deletes](/reference/resource-configs/invalidate_hard_deletes) | Find hard deleted records in source, and set `dbt_valid_to` current time if no longer exists | No | True |
 
 - A number of other configurations are also supported (e.g. `tags` and `post-hook`), check out the full list [here](/reference/snapshot-configs).

website/docs/reference/resource-configs/updated_at.md

@@ -64,7 +64,7 @@ You will get a warning if the data type of the `updated_at` column does not matc
 ## Description
 A column within the results of your snapshot query that represents when the record row was last updated.
 
-This parameter is **required if using the `timestamp` [strategy](/reference/resource-configs/strategy)**.
+This parameter is **required if using the `timestamp` [strategy](/reference/resource-configs/strategy)**. The `updated_at` field may support ISO date strings and unix epoch integers, depending on the data platform you use. 
 
 
 ## Default