Cherrypick doc fix to release branch (#728)

**Which issue is resolved by this Pull Request:**

Fixes rds s3 docs

**Testing:**
- [ ] Unit tests pass
- [ ] e2e tests pass
- Details about new tests (If this PR adds a new feature)
- Details about any manual tests performed

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

website/content/en/docs/deployment/rds-s3/guide.md

@@ -123,7 +123,7 @@ export PIPELINE_S3_CREDENTIAL_OPTION=static
 PYTHONPATH=.. python utils/rds-s3/auto-rds-s3-setup.py --region $CLUSTER_REGION --cluster $CLUSTER_NAME --bucket $S3_BUCKET --db_instance_name $DB_INSTANCE_NAME  --rds_secret_name $RDS_SECRET_NAME --db_subnet_group_name $DB_SUBNET_GROUP_NAME --pipeline_s3_credential_option $PIPELINE_S3_CREDENTIAL_OPTION
 {{< /tab >}}
    {{< tab header="IAM User" lang="toml" >}}
-PYTHONPATH=.. python utils/rds-s3/auto-rds-s3-setup.py --region $CLUSTER_REGION --cluster $CLUSTER_NAME --bucket $S3_BUCKET -s3_aws_access_key_id $MINIO_AWS_ACCESS_KEY_ID --s3_aws_secret_access_key $MINIO_AWS_SECRET_ACCESS_KEY --db_instance_name $DB_INSTANCE_NAME --s3_secret_name $S3_SECRET_NAME  --rds_secret_name $RDS_SECRET_NAME --db_subnet_group_name $DB_SUBNET_GROUP_NAME --pipeline_s3_credential_option $PIPELINE_S3_CREDENTIAL_OPTION
+PYTHONPATH=.. python utils/rds-s3/auto-rds-s3-setup.py --region $CLUSTER_REGION --cluster $CLUSTER_NAME --bucket $S3_BUCKET --s3_aws_access_key_id $MINIO_AWS_ACCESS_KEY_ID --s3_aws_secret_access_key $MINIO_AWS_SECRET_ACCESS_KEY --db_instance_name $DB_INSTANCE_NAME --s3_secret_name $S3_SECRET_NAME  --rds_secret_name $RDS_SECRET_NAME --db_subnet_group_name $DB_SUBNET_GROUP_NAME --pipeline_s3_credential_option $PIPELINE_S3_CREDENTIAL_OPTION
 {{< /tab >}}
    {{< /tabpane >}}