Update bedrock.md (#1098)

Author: Jeadie

website/docs/components/models/bedrock.md

@@ -43,7 +43,7 @@ models:
 | `aws_region`                   | AWS region for Bedrock API requests.                                                                                                                                                | -                                                                                           |
 | `aws_access_key_id`            | AWS access key ID.                                                                                                                                                                  | -                                                                                           |
 | `aws_secret_access_key`        | AWS secret access key.                                                                                                                                                              | -                                                                                           |
-| `aws_secret_access_key`        | AWS secret access key.                                                                                                                                                              | -                                                                                           |
+| `aws_session_token`        | Session token (e.g. AWS_SESSION_TOKEN for AWS) for temporary credentials                                                                                                                          | -                                                                                           |
 | `bedrock_guardrail_identifier` | Identifier for the guardrail. See [GuardrailConfiguration](https://docs.aws.amazon.com/bedrock/latest/APIReference/API_runtime_GuardrailConfiguration.html). Pattern: `(([a-z0-9]+) \| (arn:aws(-[^:]+)?:bedrock:[a-z0-9-]{1,20}:[0-9]{12}:guardrail/[a-z0-9]+))`. Length: 0-2048. | -   |
 | `bedrock_guardrail_version`    | Guardrail version. Pattern: `(([1-9][0-9]{0,7}) \| (DRAFT))`                                                                                   | -   |
 | `bedrock_trace`                | Trace behavior for the guardrail. Valid values: `enabled`, `disabled`, `enabled_full`. Default: `disabled`.                                                                         | disabled                                                                                    |