qt: Add comment to sorting step in refreshAddressTable

src/qt/addresstablemodel.cpp

@@ -80,6 +80,8 @@ public:
             }
         }
         // qLowerBound() and qUpperBound() require our cachedAddressTable list to be sorted in asc order
+        // Even though the map is already sorted this re-sorting step is needed because the originating map
+        // is sorted by binary address, not by base58() address.
         qSort(cachedAddressTable.begin(), cachedAddressTable.end(), AddressTableEntryLessThan());
     }