[zh_CN] done /zh/core-libraries/toc-behaviors.rst

- done ``/zh/core-libraries/toc-behaviors.rst``
- also update ``/zh/models/behaviors.rst`` accordingly, but :start-line: is inconsistent across ``en`` and ``zh_CN``. same inconsistency in ``/views/helpers.rst`` between these 2 languages.
- follow ``en`` changes