Fix opus.h for doxygen when referencing alternative values
Doxygen was not able to resolve the references because it looked
for OPUS_APPLICATION_VOIP/@ref.
Signed-off-by: 
Mark Harris <mark.hsj@gmail.com>
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Doxygen was not able to resolve the references because it looked
for OPUS_APPLICATION_VOIP/@ref.
Signed-off-by: Mark Harris <mark.hsj@gmail.com>