Fix typo

Author: marcelohossomi

site/docs/voice/bxml/startTranscription.mdx

@@ -89,7 +89,7 @@ If a `destination` is specified, it will be sent JSON messages for the duration
 |:------------------------------|:------------|
 | accountId                     | The user account associated with the call |
 | callId                        | The call id associated with the real-time transcription |
-| realTimetranscriptionId       | The unique id of the real-time transcription |
+| realTimeTranscriptionId       | The unique id of the real-time transcription |
 | transcriptionName             | The user supplied name of the real-time transcription |
 | tracks                        | A list of one or more tracks being transcribed in real-time |
 | tracks.name                   | The name of the track being transcribed, will be used to identify which transcription updates belong to which track |