Remove LivelinessData from API reference (#736)

Signed-off-by: EduPonz <eduardoponz@eprosima.com>
Signed-off-by: Ricardo González Moreno <ricardo@richiware.dev>

Author: EduPonz

docs/fastdds/api_reference/rtps/writer/LivelinessData.rst

@@ -5,6 +5,5 @@ RTPSWriter
 
 .. toctree::
 
-    /fastdds/api_reference/rtps/writer/LivelinessData.rst
     /fastdds/api_reference/rtps/writer/RTPSWriter.rst
     /fastdds/api_reference/rtps/writer/WriterListener.rst