Updated VertexTypes (markdown)

VertexTypes.md

@@ -14,7 +14,7 @@ The VertexTypes.h header defines these commonly used vertex data structures:
     #include <VertexTypes.h>
 
 # Input Layout
-Each type provides a ``D3D12_INPUT_ELEMENT_DESC`` structure which can be used to create a Pipeline State Object (PSO):
+Each type provides a ``D3D12_INPUT_LAYOUT_DESC`` structure which can be used to create a Pipeline State Object (PSO):
 
     D3D12_GRAPHICS_PIPELINE_STATE_DESC psoDesc = {};
     psoDesc.InputLayout = VertexPositionColor::InputLayout;