changing the mapping s2s_outlet to s2s_inlets

to better refect the real meaning of the mapping.

opm/autodiff/WellMultiSegment.hpp

@@ -89,7 +89,7 @@ namespace Opm
                                 // means the outlet segments will gather all the contribution
                                 // from all the inlet segments in a recurisive way
             M p2s_gather;       // perforation -> segment (in an accumative way)
-            M s2s_outlet;       // segment -> their outlet segments
+            M s2s_inlets;       // segment -> their inlet segments
         };
 
         const WellOps& wellOps() const;