Added SSML option (#14548)

source/_integrations/google_cloud.markdown

@@ -113,6 +113,11 @@ profiles:
   required: false
   type: list
   default: "[]"
+text_type:
+  description: "Default text type. Supported text types are `text` and `ssml`. Read more on what is that and how to use SSML [here](https://cloud.google.com/text-to-speech/docs/ssml)."
+  required: false
+  type: string
+  default: "text"
 {% endconfiguration %}
 
 ### Full configuration example
@@ -131,6 +136,7 @@ tts:
     speed: 0.9
     pitch: -2.5
     gain: -5.0
+    text_type: ssml
     profiles:
       - telephony-class-application
       - wearable-class-device