Fix spelling in comments

dune/fufem/test/dunepythontest.cc

@@ -151,7 +151,7 @@ int main(int argc, char** argv) try
     std::cout << "Example  5: Types derived from Reference ***************************************" << std::endl;
     {
         // There are various classes derived from Reference, e.g., for
-        // modules, callables, ... providig corresponding special methods.
+        // modules, callables, ... providing corresponding special methods.
         // Depending on the a-priori knowledge methods will either
         // return a Reference (e.g. get()) or a derived type (e.g. import()).
         // However you can always try to convert a Reference
@@ -169,7 +169,7 @@ int main(int argc, char** argv) try
         // You can obtain a Module by converting a Reference
         auto module3 = Python::Module(pyMain.get("dunepythontest"));
 
-        // Converting a nonmathching object will fail.
+        // Converting a nonmatching object will fail.
         pyMain.run("someInt = 3");
         auto someInt = pyMain.get("someInt");
         std::cout << someInt << std::endl;
@@ -289,10 +289,10 @@ int main(int argc, char** argv) try
         //
         // All of these can be accessed using the operator () on a
         // Python::Callable which refers to a callable python object.
-        // To obtain a Callable convert an apropriate object.
+        // To obtain a Callable convert an appropriate object.
         //
         // You can pass to Callable objects and C++ objects
-        // as arguments. In the later case they will be converted
+        // as arguments. In the latter case they will be converted
         // to python objects before the actual python call is
         // executed automatically (see below).