Update index.zh.md

[ouba421]

添加validateFields 第二个参数的文档注释

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.72%. Comparing base (495be63) to head (957df30).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #6783 +/- ## ======================================= Coverage 92.72% 92.72% ======================================= Files 335 335 Lines 7198 7198 Branches 1804 1792 -12 ======================================= Hits 6674 6674 Misses 489 489 Partials 35 35 ```

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