Update IBM Watson Speech to Text URL

source/applications/voicemail_transcription.rst

@@ -35,7 +35,10 @@ Add the following entries
   +-------------+-----------------------+-----------+---------------------------+-----------+
 
 *NOTE: Watson URL used for testing was the following:
-https://stream.watsonplatform.net/speech-to-text/api/v1/recognize?model=en-US_NarrowbandModel*
+https://stream.watsonplatform.net/speech-to-text/api/v1/recognize?model=en-US_NarrowbandModel&smart_formatting=true*
+
+**List of available IBM Watson speech to text models**
+https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models
 
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