lexer for non-default highlighting must be specified (java here)
lexer for non-default highlighting must be specified (java here)

sphinx has default highlight of python code, and we
present mostly java code in this file

Change-Id: I829fd193ab2750ae2f553ce94631a7bf23434ae4
SanMi86/doc-kurento,shelsonjava/doc-kurento,SanMi86/doc-kurento,shelsonjava/doc-kurento,shelsonjava/doc-kurento,SanMi86/doc-kurento,Kurento/doc-kurento,SanMi86/doc-kurento,Kurento/doc-kurento,shelsonjava/doc-kurento,Kurento/doc-kurento