code: def decrypt(self, document_id, encrypted_content, account):
          
          return self._secret_store(account).decrypt_document(document_id, encrypted_content)
docs: Decrypt a previously encrypted content using the secret store keys identified
          by document_id.
  
          Note that decryption requires permission already granted to the consumer account.
  
          :param document_id: hex str id of document to use to retrieve the decryption keys
          :param encrypted_content: hex str
          :param account: Account instance to use for decrypting the `encrypted_content`
          :return: str original content