[skip ci] Refine contributing guide (#9330)

Signed-off-by: Edward Zeng <jie.zeng@zilliz.com>
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edward.zeng
2021-10-06 17:16:16 +08:00
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@@ -133,7 +133,7 @@ $ make fmt
```
### C++ coding style
The c++ coding style used in Milvus generally follow [Google C++ Style Guide](https://google.github.io/styleguide/cppguide.html).
The C++ coding style used in Milvus generally follows [Google C++ Style Guide](https://google.github.io/styleguide/cppguide.html).
And we made the following changes based on the guide:
- 4 spaces for indentation