The receiving audio section in the v13 guide is missing

[onyx-nxt]

Describe the bug
The receiving audio section in the v13 guide is missing

To Reproduce

1. Go to 'Voice'
2. Search 'receiving audio.'
3. See it not there

Device (please complete the following information):

• Browser: Chrome
• Version: 96.0.4664.111 (Official Build) (64-bit)

[tony-ist]

I could submit a PR to update the docs. v12 does not work in v13, the code needs some updates.