book: fix ch06sched P destroy code comment(#64)

golang-design / under-the-hood

📚 Go: Under The Hood | Go 语言原本 | https://golang.design/under-the-hood

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Closed luckyxiaoqiang closed 4 years ago

luckyxiaoqiang commented 4 years ago

resolve #64

更准确的描述P destroy代码的功能，修正了gfpurge调用的注释。

修正了book/zh-cn/part2runtime/ch06sched/mpg.md 和 gosrc/runtime/proc.go中P destroy代码中gfpurge调用的注释。