how to mark table in markdown

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### This issue is for a: (mark with an `x`)
```
- [ ] bug report -> please search issues before submitting
- [ ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)
```

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### Expected/desired behavior
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### OS and Version?
> Windows 7, 8 or 10. Linux (which distribution). macOS (Yosemite? El Capitan? Sierra?)

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The issue names no file, test, or entry point. First clarify which Markdown content needs a table and where it belongs in the repository; done means a specific documentation location and a verified table example.

索引モデルが issue の本文から書いたものです。