The getSubsystem<T> example in the manual currently fails with a codegen error

A faulty proc declaration is generated:
N_NIMCALL(System::Input*, SystemManager::getSubsystem<'*0>())(void);
The manual has been edited to add a nodecl pragma, which alleviates the issue

Fix a typo in the vector_iterator example from the previous commit.

tests/cpp/vector_iterator.nim

@@ -6,16 +6,14 @@ discard """
 
 template <class T>
 struct Vector {
-  struct Iterator {
-
-  };
+  struct Iterator {};
 };
 
 """.}
 
 type
   Vector {.importcpp: "Vector".} [T] = object
-  VectorIterator {.importcpp: "Vector<'2>::Iterator".} [T] = object
+  VectorIterator {.importcpp: "Vector<'0>::Iterator".} [T] = object
 
 var x: VectorIterator[void]