Remove accidentally duplicated section

Signed-off-by: Dmitriy Barbul <dimabarbul@gmail.com>

documentation/src/main/resources/pages/ditto/basic-acknowledgements.md

@@ -443,16 +443,3 @@ disposition frames, and MQTT PUBACK/PUBREC/PUBREL messages for incoming PUBLISH
 | Connectivity | true              | empty          | non-zero | Response published at reply-target;<br/>message settled immediately |
 | Connectivity | true              | non-empty      | zero     | Error published at reply-target: timeout may not be zero if response is required;<br/>message settled negatively |
 | Connectivity | true              | non-empty      | non-zero | Aggregated response and acknowledgements published at reply-target;<br/>message settled after receiving the requested acknowledgements |
-
-### Default header values
-Ditto set each of the three headers `response-required`, `requested-acks`, `timeout` to a default value according to any
-values of the other two headers set by the user.  
-The default values depend only on headers set by the user; they do not depend on each other.  
-Setting the default header values this way never produces any combination considered a client error unless the headers
-set by the user already cause a client error.
-
-| Header            | Default value | Default value if all three headers are not set |
-| ---               | ---           | ---                                              |
-| response-required | `false` if `timeout` is zero, `true` otherwise | `true` |
-| requested-acks    | `empty` if `timeout` is zero or `response-required` is `false`, the channel's default acknowledgement request otherwise |`["twin-persisted"]` for TWIN channel,<br/>`["live-response"]` for LIVE channel |
-| timeout           | `60s` | `60s` |