987 fix: clarify transcription fee explanation in pricing documentation

Author: saudsami

real-time-stt/overview/pricing.mdx

@@ -20,7 +20,7 @@ Your billing details may differ if you have signed a contract with Agora.
 
 ## Transcription fee
 
-When <Vpd k="NAME"/> is enabled for a channel, it transcribes the audio of the active hosts. When <Vpd k="NAME"/> is enabled for specific hosts, it only transcribes the audio of the specified hosts and ignores others. The <Vpd k="NAME"/> service excludes minutes when end users mute their audio and stop sending out audio streams. The audio stream is transcribed by the <Vpd k="NAME"/> engine and its duration is referred to as the transcription duration. Agora charges for the transcription duration of all or specified hosts in the channel. The unit price is as follows:
+When <Vpd k="NAME"/> is enabled for a channel, it transcribes the audio of the active hosts. When <Vpd k="NAME"/> is enabled for specific hosts, it only transcribes the audio of the specified hosts and ignores others. The <Vpd k="NAME"/> service excludes minutes when hosts mute their audio. The audio stream is transcribed by the <Vpd k="NAME"/> engine and its duration is referred to as the transcription duration. Agora charges for the transcription duration of all or specified hosts in the channel. The unit price is as follows:
 
 |Billing item |Usage, minutes per month |Pricing, US$/1,000 minutes|
 |:------------|:------------------:|:------------------------:|
@@ -33,7 +33,7 @@ After you enable <Vpd k="NAME"/>:
 - Host B speaks for 3 minutes and remains muted for 7 minutes.
 - Host C speaks for 3 minutes and remains muted for 7 minutes.
 
-In this case, the total transcription minutes are calculated as 2 (Host A) + 3 (Host B) + 3 (Host C) = 8 minutes. The period when hosts are muted and/or their time spent listening to others, is not counted towards the transcription duration. 
+In this case, the total transcription minutes are calculated as 2 (Host A) + 3 (Host B) + 3 (Host C) = 8 minutes. The period when hosts are muted is not counted towards the transcription duration. 
 
 <Admonition type="info" title="Note">
 A standby fee of $0.99 per 1,000 minutes is charged if <Vpd k="NAME"/> is enabled and all hosts are muted.