Fix invalid documentation for StreamingQueryManager Class

When following the example for using `spark.streams().awaitAnyTermination()` a valid pyspark code will output the following error:

```Traceback (most recent call last):
  File "pyspark_app.py", line 182, in <module>
    spark.streams().awaitAnyTermination()
TypeError: 'StreamingQueryManager' object is not callable```

This changes the documentation line to properly call the method under the StreamingQueryManager Class
https://spark.apache.org/docs/latest/api/python/pyspark.sql.html#pyspark.sql.streaming.StreamingQueryManager

Author: asaf400

docs/structured-streaming-programming-guide.md

@@ -2554,11 +2554,11 @@ spark.streams().awaitAnyTermination();   // block until any one of them terminat
 {% highlight python %}
 spark = ...  # spark session
 
-spark.streams().active  # get the list of currently active streaming queries
+spark.streams.active  # get the list of currently active streaming queries
 
-spark.streams().get(id)  # get a query object by its unique id
+spark.streams.get(id)  # get a query object by its unique id
 
-spark.streams().awaitAnyTermination()  # block until any one of them terminates
+spark.streams.awaitAnyTermination()  # block until any one of them terminates
 {% endhighlight %}
 
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