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修改示例中的错误

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原书中的变量名是“i”而不是"x"
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1.DeducingTypes/item3.md
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@ -5,7 +5,7 @@
我们将从一个简单的情况开始，没有任何令人惊讶的情况。相比模板类型推导和auto类型推导，decltype只是简单的返回名字或者表达式的类型：
````cpp
const int x=0; //decltype(i)是const int
const int i=0; //decltype(i)是const int
bool f(const Widget& w); //decltype(w)是const Widget&
//decltype(f)是bool(const Widget&)