Update SSD documentation (#987)
* Refine documentation and code.
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![fluid/object_detection/images/009943.jpg](https://gitcode.net/paddlepaddle/models/-/raw/894e7ac08c9ade1cbf54b517f1a3ca55cd39e768/fluid/object_detection/images/009943.jpg)
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![fluid/object_detection/images/009943.jpg](https://gitcode.net/paddlepaddle/models/-/raw/894e7ac08c9ade1cbf54b517f1a3ca55cd39e768/fluid/object_detection/images/009943.jpg)
![fluid/object_detection/images/009956.jpg](https://gitcode.net/paddlepaddle/models/-/raw/894e7ac08c9ade1cbf54b517f1a3ca55cd39e768/fluid/object_detection/images/009956.jpg)
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![fluid/object_detection/images/009956.jpg](https://gitcode.net/paddlepaddle/models/-/raw/894e7ac08c9ade1cbf54b517f1a3ca55cd39e768/fluid/object_detection/images/009956.jpg)
![fluid/object_detection/images/009956.jpg](https://gitcode.net/paddlepaddle/models/-/raw/894e7ac08c9ade1cbf54b517f1a3ca55cd39e768/fluid/object_detection/images/009956.jpg)
![fluid/object_detection/images/009960.jpg](https://gitcode.net/paddlepaddle/models/-/raw/894e7ac08c9ade1cbf54b517f1a3ca55cd39e768/fluid/object_detection/images/009960.jpg)
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![fluid/object_detection/images/009960.jpg](https://gitcode.net/paddlepaddle/models/-/raw/894e7ac08c9ade1cbf54b517f1a3ca55cd39e768/fluid/object_detection/images/009960.jpg)
![fluid/object_detection/images/009960.jpg](https://gitcode.net/paddlepaddle/models/-/raw/894e7ac08c9ade1cbf54b517f1a3ca55cd39e768/fluid/object_detection/images/009960.jpg)
![fluid/object_detection/images/009962.jpg](https://gitcode.net/paddlepaddle/models/-/raw/894e7ac08c9ade1cbf54b517f1a3ca55cd39e768/fluid/object_detection/images/009962.jpg)
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![fluid/object_detection/images/009962.jpg](https://gitcode.net/paddlepaddle/models/-/raw/894e7ac08c9ade1cbf54b517f1a3ca55cd39e768/fluid/object_detection/images/009962.jpg)
![fluid/object_detection/images/009962.jpg](https://gitcode.net/paddlepaddle/models/-/raw/894e7ac08c9ade1cbf54b517f1a3ca55cd39e768/fluid/object_detection/images/009962.jpg)
* Refine documentation and code.
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