修改 auto 的错误措辞，格式化格式
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| > {{ icon.fun }} C++11：auto 只能用于定义变量；C++14：函数返回类型可以是 auto；C++17：模板参数也可以 auto；C++20：函数参数也可以是 auto 了；（狂想）C++47：auto 现在是 C++47 的唯一关键字，用户只需不断输入 auto-auto-auto，编译器内建人工智能自动识别你的意图生成机器码。 | ||
| > {{ icon.fun }} C++11：auto 只能用于定义变量以及作为函数返回类型的占位符（无法自行推导）；C++14：函数返回类型可以是 auto 并自动推导；C++17：模板非类型参数也可以 auto；C++20：函数参数也可以是 auto 了；（狂想）C++47：auto 现在是 C++47 的唯一关键字，用户只需不断输入 auto-auto-auto，编译器内建人工智能自动识别你的意图生成机器码。 |
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C++14 就能有 auto 函数参数，虽然只能用在 lambda 里。 可以将 C++20 的相关改动视为解决了 C++14/17 中存在两套互斥的函数模板语法这一奇怪现象。
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修改
auto的错误措辞，格式化格式