chore: Remove comments about NE_PolyEnd() being ignored

It's not 100% clear that the command is ignored. It's better to remove
the comments unless we're completely sure about it.

examples/other/polygon_colored/source/main.c

@@ -28,7 +28,6 @@ void Draw3DScene(void)
         NE_PolyColor(NE_Blue);
         NE_PolyVertex(1, 1, 0);
 
-    // This seems to not be needed
     NE_PolyEnd();
 }
 

examples/other/polygon_textured/source/main.c

@@ -39,7 +39,6 @@ void Draw3DScene(void)
         NE_PolyTexCoord(64, 0);
         NE_PolyVertex(1, 1, 0);
 
-    // Apparently this command is ignored by the GPU
     NE_PolyEnd();
 }