Minor spelling fix in the camera OpenGL tutorial (#489)

nothing but spell modification

Author: Ryuujo Zhang

examples/CSharp/OpenGL Tutorials/Tutorial 2.2 - Camera/Program.cs

@@ -179,7 +179,7 @@ private static unsafe void OnRender(double deltaTime)
             Shader.SetUniform("uView", view);
             Shader.SetUniform("uProjection", projection);
 
-            //We're drawing with just vertices and no indicies, and it takes 36 verticies to have a six-sided textured cube
+            //We're drawing with just vertices and no indices, and it takes 36 vertices to have a six-sided textured cube
             Gl.DrawArrays(PrimitiveType.Triangles, 0, 36);
         }
 
@@ -229,4 +229,4 @@ private static void KeyDown(IKeyboard keyboard, Key key, int arg3)
             }
         }
     }
-}
+}