Corrected link [概要] updates and modified Japanese translation

I have one question. In 7.5;
About Golang os.RemoveAll, the original Chinese script says "如果path是单个名称，那么该目录不删除", what does it mean?
In the Go-lang document, it is described as;
http://golang.org/pkg/os/#RemoveAll
> RemoveAll removes path and any children it contains. It removes everything it can but returns the first error it encounters. If the path does not exist, RemoveAll returns nil (no error).
There are no description about "该目录不删除" caused by"单个名称", I think.