Update finetune_and_eval.md

docs/API/finetune_and_eval.md

@@ -27,7 +27,6 @@
 >     image_width=resnet_module.get_excepted_image_width(),
 >     image_height=resnet_module.get_excepted_image_height(),
 >     dataset=dataset)
-> with fluid.program_guard(program):
 > label = fluid.layers.data(name="label", dtype="int64", shape=[1])
 > img = input_dict[0]
 > feature_map = output_dict[0]