MLECO-1858: Documentation update

* Removing `_` in front of private functions and member

Signed-off-by: Isabella Gottardi <isabella.gottardi@arm.com>
Change-Id: I5a5d652f9647ebb16d2d2bd16ab980e73f7be3cf
diff --git a/source/use_case/ad/include/AdMelSpectrogram.hpp b/source/use_case/ad/include/AdMelSpectrogram.hpp
index 30a77c1..05c5bfc 100644
--- a/source/use_case/ad/include/AdMelSpectrogram.hpp
+++ b/source/use_case/ad/include/AdMelSpectrogram.hpp
@@ -69,7 +69,7 @@
          *              energies to logarithmic scale. The difference from
          *              default behaviour is that the power is converted to dB
          *              and subsequently clamped.
-         * @param[in/out]   melEnergies - 1D vector of Mel energies
+         * @param[in,out]   melEnergies - 1D vector of Mel energies
          **/
         virtual void ConvertToLogarithmicScale(std::vector<float>& melEnergies) override;