Chapter 2 intro翻译问题

[jl4386]

Using it saves typing, sure, but it also prevents correctness and performance issues that can bedevil manual type declarations 应该是指auto比起手动声明类型，避免了正确性和性能问题，而非相反。

[Jebearssica]

额外补充，because falling back on manual type declarations is an alternative that’s often best avoided. 中的 manual type 应该指的是手动补全类型，而不应该直接翻译成 manual —— 手册

[standback]

Using it saves typing, sure, but it also prevents correctness and performance issues that can bedevil manual type declarations 应该是指auto比起手动声明类型，避免了正确性和性能问题，而非相反。

的确是有翻的有问题。
可以上个pr改一下