async fn update_document(
        &self,
        input: UpdateDocumentRequest,
    ) -> Result<UpdateDocumentResult, RusotoError<UpdateDocumentError>> {
        let mut request = self.new_signed_request("POST", "/");
        request.add_header("x-amz-target", "AmazonSSM.UpdateDocument");
        let encoded = serde_json::to_string(&input).unwrap();
        request.set_payload(Some(encoded));

        let response = self
            .sign_and_dispatch(request, UpdateDocumentError::from_response)
            .await?;
        let mut response = response;
        let response = response.buffer().await.map_err(RusotoError::HttpDispatch)?;
        proto::json::ResponsePayload::new(&response).deserialize::<UpdateDocumentResult, _>()
    }
<p>Updates one or more values for an SSM document.</p>
rusoto/services/ssm/src/generated.rs