Update golang_tutorial_03.md

fix: 申明变量: 去掉多余的“,”
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Coffen 6 years ago committed by GitHub
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@ -165,7 +165,7 @@ new width is 100 new height is 50
有些时候我们需要在一条语句中**声明多个不同类型的变量**。我们可以使用下面的语法达到此目的:
```golang
var (
name1 = initialvalue1,
name1 = initialvalue1
name2 = initialvalue2
)
```

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