Updates the parameters of a parameter group. You can modify up to 20 parameters in a single request by submitting a list parameter name and value pairs.
ParameterGroupName: [required] The name of the parameter group to update.
ParameterNameValues: [required] An array of parameter names and values for the parameter update. You must supply at least one parameter name and value; subsequent arguments are optional. A maximum of 20 parameters may be updated per request.