docs : fix duplicate word typo in VAD section (#3670)

The VAD section contained a spurious 'the' at the end of a sentence,
creating the run-on 'Using this information the / only the speech
segments...'. Replace the orphaned 'the' with a comma so the sentence
reads correctly: 'Using this information, only the speech segments...'.

Author: cluster2600

README.md

@@ -755,7 +755,7 @@ argument to `whisper-cli`. In addition to this option a VAD model is also
 required.
 
 The way this works is that first the audio samples are passed through
-the VAD model which will detect speech segments. Using this information the
+the VAD model which will detect speech segments. Using this information,
 only the speech segments that are detected are extracted from the original audio
 input and passed to whisper for processing. This reduces the amount of audio
 data that needs to be processed by whisper and can significantly speed up the