Fix typo in programming_guide and lod_tensor (#1131)
* fix typo in doc * add faq for lod_tensor * format the lod_tensor.rst
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![doc/fluid/advanced_usage/design_idea/image/fluid_process.png](https://gitcode.net/paddlepaddle/FluidDoc/-/raw/35aa2eaaf0f86e431692f897381d4d86aee419a8/doc/fluid/advanced_usage/design_idea/image/fluid_process.png)
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![doc/fluid/advanced_usage/design_idea/image/fluid_process.png](https://gitcode.net/paddlepaddle/FluidDoc/-/raw/35aa2eaaf0f86e431692f897381d4d86aee419a8/doc/fluid/advanced_usage/design_idea/image/fluid_process.png)
![doc/fluid/advanced_usage/design_idea/image/fluid_process.png](https://gitcode.net/paddlepaddle/FluidDoc/-/raw/35aa2eaaf0f86e431692f897381d4d86aee419a8/doc/fluid/advanced_usage/design_idea/image/fluid_process.png)
* fix typo in doc * add faq for lod_tensor * format the lod_tensor.rst
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