Update how-to-custom-speech-test-and-train.md

Author: eric-urban

articles/cognitive-services/Speech-Service/how-to-custom-speech-test-and-train.md

@@ -44,7 +44,7 @@ This table lists accepted data types, when each data type should be used, and th
 
 | Data type | Used for testing | Recommended quantity | Used for training | Recommended quantity |
 |-----------|-----------------|----------|-------------------|----------|
-| [Audio](#audio-data-for-testing) | Yes<br>Used for visual inspection | 5+ audio files | No | N/A |
+| [Audio only](#audio-data-for-testing) | Yes<br>Used for visual inspection | 5+ audio files | No | N/A |
 | [Audio + Human-labeled transcripts](#audio--human-labeled-transcript-data-for-trainingtesting) | Yes<br>Used to evaluate accuracy | 0.5-5 hours of audio | Yes | 1-20 hours of audio |
 | [Plain text](#plain-text-data-for-training) | No | N/a | Yes | 1-200 MB of related text |
 | [Structured text](#structured-text-data-for-training-public-preview) (Public Preview) | No | N/a | Yes | Up to 10 classes with up to 4000 items and up to 50,000 training sentences |