Add auto-parallel docs for 3.0 (#7170)

* Add auto-parallel docs for 3.0

* Update for code-style

* Update for code-style

* Fix

* Fix

* Fix

* Update

Author: From00

docs/dev_guides/api_contributing_guides/api_contributing_guides_cn.rst

@@ -105,6 +105,7 @@ API 设计文档的目的是为了社区开发者更容易的参与开源项目
     read_before_contributing_cn.md
     new_python_api_cn.md
     new_cpp_op_cn.md
+    auto_parallel_op_cn.md
     api_design_guidelines_standard_cn.md
     api_docs_guidelines_cn.md
     api_accpetance_criteria_cn.md