Update speech-synthesis-markup-voice.md

Author: sally-baolian

articles/ai-services/speech-service/speech-synthesis-markup-voice.md

@@ -407,7 +407,7 @@ Any audio included in the SSML document must meet these requirements:
 * The audio must not contain any customer-specific or other sensitive information.
 
 > [!NOTE]
-> The `audio` element is not supported by the [Long Audio API](migrate-to-batch-synthesis.md#text-inputs). For long-form text to speech, use the [batch synthesis API](batch-synthesis.md) (Preview) instead.
+> The `audio` element is not supported by the [Long Audio API](migrate-to-batch-synthesis.md#text-inputs). For long-form text to speech, use the [batch synthesis API](batch-synthesis.md) instead.
 
 The following table describes the usage of the `audio` element's attributes: