Update get-started-with-real-time-text.md

Author: lisaleehan

articles/communication-services/quickstarts/voice-video-calling/get-started-with-real-time-text.md

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 # Real Time Text
 
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 Learn how to integrate Real Time Text (RTT) into your calling applications to enhance accessibility and ensure that all participants can communicate effectively during meetings.
 
 RTT allows users who have difficulty speaking to participate actively by typing their messages, which are then broadcast in near real-time to other meeting participants. This feature operates seamlessly alongside existing captions and ensures that typed messages are promptly delivered without disrupting the flow of conversation.
 
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 ## Real Time Text Feature Overview
 
 Real Time Text (RTT) is designed to facilitate communication for users who may have difficulty speaking during calls. By allowing users to type their messages, RTT ensures that everyone in the meeting can stay engaged and informed. Messages are transmitted over Data Channels (ID 24) and are always active, appearing automatically when the first message is sent.