align reshape input param with pytorch

[BBuf]

对齐Tensor.reshape的输入，不需要输入参数多包一层()。由于Tensor.reshape和flow.reshape输入参数的形式不同，前者是*shape，后者是shape所以docstring不能共用，这里修改了一下Tensor.reshape的docstring。

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CI failed, removing label automerge

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CI failed, removing label automerge

[github-actions]

CI failed, removing label automerge

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CI failed, removing label automerge

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Speed stats:

GPU Name: GeForce GTX 1080 

PyTorch resnet50 time: 140.1ms (= 7004.1ms / 50, input_shape=[16, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 128.2ms (= 6411.4ms / 50, input_shape=[16, 3, 224, 224], backward is enabled)
Relative speed: 1.09 (= 140.1ms / 128.2ms)

PyTorch resnet50 time: 83.7ms (= 4187.4ms / 50, input_shape=[8, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 74.8ms (= 3737.6ms / 50, input_shape=[8, 3, 224, 224], backward is enabled)
Relative speed: 1.12 (= 83.7ms / 74.8ms)

PyTorch resnet50 time: 57.6ms (= 2878.0ms / 50, input_shape=[4, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 48.3ms (= 2412.7ms / 50, input_shape=[4, 3, 224, 224], backward is enabled)
Relative speed: 1.19 (= 57.6ms / 48.3ms)

PyTorch resnet50 time: 48.5ms (= 2427.1ms / 50, input_shape=[2, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 39.4ms (= 1970.6ms / 50, input_shape=[2, 3, 224, 224], backward is enabled)
Relative speed: 1.23 (= 48.5ms / 39.4ms)

PyTorch resnet50 time: 42.9ms (= 2144.9ms / 50, input_shape=[1, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 39.1ms (= 1957.0ms / 50, input_shape=[1, 3, 224, 224], backward is enabled)
Relative speed: 1.10 (= 42.9ms / 39.1ms)