ParameterGroupName: [required] The name of the parameter group to be modified.
Parameters: [required] An array of parameters to be modified. A maximum of 20 parameters can be modified in a single request.
For each parameter to be modified, you must supply at least the parameter name and parameter value; other name-value pairs of the parameter are optional.
For the workload management (WLM) configuration, you must supply all the name-value pairs in the wlm_json_configuration parameter.