Update deprecated code snippets in ZH-CN translations

[Royc30ne]

Some code snippets in zh-CN tutorials are not executable due to deprecated functions

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Localization

Translators and reviewers are encouraged to submit pull requests from our GitLocalize project.

Preview

Preview and run these notebook edits with Google Colab:

• site/zh-cn/federated/tutorials/custom_federated_algorithms_2.ipynb

Rendered notebook diffs available on ReviewNB.com.

Format and style

Use the TensorFlow docs notebook tools to format for consistent source diffs and lint for style:

$ python3 -m pip install -U --user git+https://github.com/tensorflow/docs

$ python3 -m tensorflow_docs.tools.nbfmt notebook.ipynb

$ python3 -m tensorflow_docs.tools.nblint --arg=repo:tensorflow/docs-l10n \ 
    --styles=tensorflow,tensorflow_docs_l10n notebook.ipynb

If commits are added to the pull request, synchronize your local branch: git pull origin c9306febf9656eedeb1975246e554072d198cc2f