[spaces.l2.fv] fix bug in vector-valued FV basis

dune/gdt/spaces/basis/finite-volume.hh

@@ -58,7 +58,7 @@ public:
 
   size_t max_size() const override final
   {
-    return 1;
+    return r;
   }
 
   using BaseType::localize;

dune/gdt/spaces/l2/finite-volume.hh

@@ -27,7 +27,7 @@ namespace Dune {
 namespace GDT {
 
 
-// forward, to allow for specialization
+// forwards, to allow for specialization
 template <class GV, size_t r = 1, size_t rC = 1, class R = double>
 class FiniteVolumeSpace
 {