fix: Fixed docstrings for Dataset in AutoMLForecastingTrainingJob

Author: ivanmkc

google/cloud/aiplatform/training_jobs.py

@@ -3930,7 +3930,7 @@ def run(
             Supported only for tabular Datasets.
 
         Args:
-            dataset (datasets.Dataset):
+            dataset (datasets.TimeSeriesDataset):
                 Required. The dataset within the same Project from which data will be used to train the Model. The
                 Dataset must use schema compatible with Model being trained,
                 and what is compatible should be described in the used
@@ -4136,7 +4136,7 @@ def _run_with_experiments(
         10% for validation, and 10% for test.
 
         Args:
-            dataset (datasets.Dataset):
+            dataset (datasets.TimeSeriesDataset):
                 Required. The dataset within the same Project from which data will be used to train the Model. The
                 Dataset must use schema compatible with Model being trained,
                 and what is compatible should be described in the used
@@ -4352,7 +4352,7 @@ def _run(
             Supported only for tabular Datasets.
 
         Args:
-            dataset (datasets.Dataset):
+            dataset (datasets.TimeSeriesDataset):
                 Required. The dataset within the same Project from which data will be used to train the Model. The
                 Dataset must use schema compatible with Model being trained,
                 and what is compatible should be described in the used