[ci skip] Update VoiceNext audio transmission guide
Created by: Speyd3r
The variable vnc doesnt exist in that context
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Summary
Fixes a mistake in the Vnext article
Details
There was a varible that doesnt exist mentioned in the join command example
Changes proposed
- Fixing that misleading line
Notes
Someone got confused by this, thats why I changed it (Dont know why that other line counts as edited, it has 0 changes)