add n_best_runs param detail (#3326)

sdk/python/jobs/pipelines/1k_demand_forecast_pipeline/aml-demand-forecast-mm-pipeline/aml-demand-forecast-mm-pipeline.ipynb

@@ -480,6 +480,7 @@
     "| **partition_column_names** | The names of columns used to group your models. For timeseries, the groups must not split up individual time-series. That is, each group must contain one or more whole time-series. |\n",
     "| **allow_multi_partitions** | A flag that allows users to train one model per partition when each partition contians more than one unique time series. The dafault value is `False`. |\n",
     "| **track_child_runs**       | Flag to disable tracking of child runs. Only best run is tracked if the flag is set to False (this includes the model and metrics of the run). |\n",
+    "| **n_best_runs**            | Number of best runs to track per partition for a Many Models Run. Defaults to 1. Please set `track_child_runs` to `True` and then modify this parameter. |\n",
     "| **enable_early_stopping**  | Flag to enable early termination if the primary metric is no longer improving. |\n",
     "| **max_trials** | Represents the maximum number of trials an Automated ML job can try to run a training algorithm with different combination of hyperparameters. Its default value is set to 1000. If `enable_early_stopping` is defined, then the number of trials used to run training algorithms can be smaller.|\n",
     "| **timeout_minutes** | Maximum amount of time in minutes that the whole AutoML job can take before the job terminates. This timeout includes setup, featurization and training runs but does not include the ensembling and model explainability runs at the end of the process since those actions need to happen once all the trials (children jobs) are done. If not specified, the default job's total timeout is 6 days (8,640 minutes). To specify a timeout less than or equal to 1 hour (60 minutes), make sure your dataset's size is not greater than 10,000,000 (rows times column) or an error results. |\n",