[sr-dev] [kamailio/kamailio] Document record-call option in rtpengine (#1221)

[aalba6675]

### Description
Document record-call option in rtpengine module

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### Troubleshooting
rtpengine module has an undocumented option in rtpengine_manage and rtpengine_offer

```
rtpengine_manage("record-call=on")
```
The use case is to start the recording immediately so the recording structures are initialized in rtpengine. If we do not do this but use a sequence like

```
rtpengine_manage() /* A */
/* what happens is recording structures are no initialized so 
    metadata for caller's SDP is not written ou
    */
start_recording()    /* B */
```
The metadata of the recording will omit the caller's SDP because this is written out during A but recording structures are only initialized in B.

https://github.com/sipwise/rtpengine/issues/385




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