[ntuple] fix doxygen syntax

Co-authored-by: Jonas Hahnfeld <[email protected]>

Author: jblomer

tree/ntuple/inc/ROOT/RPageStorage.hxx

@@ -820,8 +820,8 @@ public:
    RResult<ROOT::Internal::RPage>
    UnsealPage(const RSealedPage &sealedPage, const ROOT::Internal::RColumnElementBase &element);
 
-   // Builds the streamer info records from the descriptor's extra type info section. This is necessary when
-   // connecting streamer fields so that emulated classes can be read.
+   /// Builds the streamer info records from the descriptor's extra type info section. This is necessary when
+   /// connecting streamer fields so that emulated classes can be read.
    void RegisterStreamerInfos();
 }; // class RPageSource