updateDocumentMetadata method
      
Future<void> 
updateDocumentMetadata({ 
    
- required DocumentReviews documentReviews,
- required String name,
- String? documentVersion,
Updates information related to approval reviews for a specific version of a document.
May throw InternalServerError. May throw InvalidDocument. May throw InvalidDocumentOperation. May throw InvalidDocumentVersion.
Parameter documentReviews :
The document review details to update.
Parameter name :
The name of the document for which a version is to be updated.
Parameter documentVersion :
The version of a document to update.
Implementation
Future<void> updateDocumentMetadata({
  required DocumentReviews documentReviews,
  required String name,
  String? documentVersion,
}) async {
  ArgumentError.checkNotNull(documentReviews, 'documentReviews');
  ArgumentError.checkNotNull(name, 'name');
  final headers = <String, String>{
    'Content-Type': 'application/x-amz-json-1.1',
    'X-Amz-Target': 'AmazonSSM.UpdateDocumentMetadata'
  };
  await _protocol.send(
    method: 'POST',
    requestUri: '/',
    exceptionFnMap: _exceptionFns,
    // TODO queryParams
    headers: headers,
    payload: {
      'DocumentReviews': documentReviews,
      'Name': name,
      if (documentVersion != null) 'DocumentVersion': documentVersion,
    },
  );
}