docs: use timeout in create dataset sample (#52)

* docs: use timeout in create dataset sample

* Emphasize "explicit" in comment timeout

Author: plamut

samples/create_dataset.py

@@ -30,9 +30,9 @@ def create_dataset(dataset_id):
     # TODO(developer): Specify the geographic location where the dataset should reside.
     dataset.location = "US"
 
-    # Send the dataset to the API for creation.
+    # Send the dataset to the API for creation, with an explicit timeout.
     # Raises google.api_core.exceptions.Conflict if the Dataset already
     # exists within the project.
-    dataset = client.create_dataset(dataset)  # Make an API request.
+    dataset = client.create_dataset(dataset, timeout=30)  # Make an API request.
     print("Created dataset {}.{}".format(client.project, dataset.dataset_id))
     # [END bigquery_create_dataset]