cmd/go/internal/test: Documentation about "package's source root" is imprecise. #64303
Description
$ go version 1.21.4
In the documentation of test package, it is said
Tests that open files within the package's source root (usually
$GOPATH) or that consult environment variables only match future runs in which the files and environment variables are unchanged.
However, is "the package's source root" really usually $GOPATH (e.g. ~/go)?