* update layers_nn

* Update layers_cn.rst

* Update layers_cn.rst

* update api_cn except layers

* update fluid_cn.rst

* Update metrics_cn.rst

* update_ciwhl

* update_2nd

* fix_3rd

* fix_deadlinks (#476)

* [infer][rl_note]develop=1.2 (#480)

* update_infer_toctree

* add_fluid

* Update release_note.rst

* update_install_doc

* update layers_cn_by_wh

* Fix some typo 1211 (#483)

* fix some typo

* Update nets_cn.rst

* update_version

* refine info of whl (#485)

* refine info of whl

* fix link for release-whls

* remove fast install info (#486)

* refine info of whl

* fix link for release-whls

* remove fast install info