docs: update streaming notebook (#875)

Author: GarrettWu

notebooks/streaming/streaming_dataframe.ipynb

@@ -5,12 +5,12 @@
    "metadata": {},
    "source": [
     "### BigFrames StreamingDataFrame\n",
-    "bigframes.streaming.StreamingDataFrame is a special DataFrame type that allows simple operations and can create steaming jobs to BigTable and PubSub.\n",
+    "bigframes.streaming.StreamingDataFrame is a special DataFrame type that allows simple operations and can create streaming jobs to process real-time data and reverse ETL output to Bigtable and Pub/Sub using [BigQuery continuous queries](https://cloud.google.com/bigquery/docs/continuous-queries-introduction).\n",
     "\n",
     "In this notebook, we will:\n",
     "* Create a StreamingDataFrame from a BigQuery table\n",
-    "* Do some opeartions like select, filter and preview the content\n",
-    "* Create and manage streaming jobs to both BigTable and Pubsub"
+    "* Do some operations like select, filter and preview the content\n",
+    "* Create and manage streaming jobs to both Bigtable and Pub/Sub"
    ]
   },
   {