[sr-dev] [kamailio/kamailio] tos as text does not works (Issue #3368)

### Description According to [RFC4594](https://datatracker.ietf.org/doc/html/rfc4594#page-19) ``` -- | Service | DSCP |DSCP | Application| | Class Name | Name |Value|

[sr-dev] [kamailio/kamailio] Docs fixes (PR #3367)

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