Update all the examples which use paddle.static.nn.fc.

[Xreki]

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#27768 修改了paddle.static.nn.fc接口的部分参数名，但是一些代码示例没有随之改过来。这个PR修复所有引用到paddle.static.nn.fc的代码示例。

其中红色框标注的是源码实现中，调用的是fluid.layers.nn.fc，具体见https://github.com/PaddlePaddle/Paddle/blob/develop/python/paddle/fluid/layers/rnn.py#L3397 ，因此不用修改。

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[Xreki]

2020-10-13 20:27:58 ****************
2020-10-13 20:27:58 0. You must have one RD (XiaoguangHu01,Xreki,luotao1) approval for python/paddle/fluid/compiler.py, which manages the underlying code for fluid.
2020-10-13 20:27:58 1. You must have one RD (XiaoguangHu01,Xreki,luotao1) approval for python/paddle/fluid/framework.py, which manages the underlying code for fluid.
2020-10-13 20:27:58 2. You must have one RD (XiaoguangHu01,Xreki,luotao1) approval for python/paddle/fluid/backward.py, which manages the underlying code for fluid.
2020-10-13 20:27:58 There are 3 approved errors.
2020-10-13 20:27:58 ****************

请@luotao1 帮忙review下。

2020-10-13 21:43:20 ****************
2020-10-13 21:43:20 0. You must have one TPM (saxon-zh or jzhang533 or swtkiwi or Heeenrrry or TCChenlong) approval for the api change for the management reason of API document.
2020-10-13 21:43:20 1. APIs without core.ops: 
2020-10-13 21:43:20 paddle.fluid.layers.py_func
2020-10-13 21:43:20 paddle.fluid.backward.append_backward
2020-10-13 21:43:20 paddle.static.append_backward
2020-10-13 21:43:20 paddle.static.py_func
2020-10-13 21:43:20 You must have one RD (zhiqiu (Recommend) or phlrain) approval for the api change for the opreator-related api without 'core.ops'.
2020-10-13 21:43:20 For more details, please click [https://github.com/PaddlePaddle/Paddle/wiki/paddle_api_development_manual.md]
2020-10-13 21:43:20 
2020-10-13 21:43:20 There are 2 approved errors.
2020-10-13 21:43:20 ****************

请@TCChenlong 和@zhiqiu 帮忙review下。

[TCChenlong]

LGTM

[luotao1]

LGTM for framework.py

[zhiqiu]

LGTM