fix minor indented formatting

Genes.h

@@ -191,7 +191,7 @@ private:
   size_t mOriginalNumSites; ///< Original number of sites (before cleaning)
 
   std::map<std::string, std::vector<int> > mMapCodonToPosition; ///< Map codons
-    ///(including ambiguous ones) to positions on the CPV
+  /// (including ambiguous ones) to positions on the CPV
   std::vector<int>
       mEmptyVector; ///< Empty vector to be returned if no position available
   mutable std::vector<int>