docs: def get_installed_extension(name,
                              user=None,
                              host=None,
                              port=None,
                              maintenance_db=None,
                              password=None,
                              runas=None):
      '''
      Get info about an installed postgresql extension
  
      CLI Example:
  
      .. code-block:: bash
  
          salt '*' postgres.get_installed_extension plpgsql
  
      '''
      return installed_extensions(user=user,
                                  host=host,
                                  port=port,
                                  maintenance_db=maintenance_db,
                                  password=password,
                                  runas=runas).get(name, None)