book: fix imprecise description of NULL in C++
#279
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resolve #274
Description
The description of
NULLin C++ in 02-usability.md was fundamentally wrong. This PR correct the description and explain what null pointer constants does.Change List
NULLin C++Reference
说明
02-usability.md 中关于
NULL在 C++ 中的描述有基础错误。此 PR 更正描述并解释了空指针常量会做什么。变化箱单
NULL在 C++ 中的错误描述参考文献