fa79247826
Fix file metadata documentation for Windows
I noticed that the documentation for `fs::symlink_metadata()` and `fs::metadata()` is incorrect; [the underlying code](481db40311/library/std/src/sys/windows/fs.rs (L334)) calls [`GetFileInformationByHandle()`](https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-getfileinformationbyhandle) on Windows, not [`GetFileAttributesEx()`](https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-getfileattributesexw). There are currently [no uses of `GetFileAttributesEx()` in this repo](https://github.com/rust-lang/rust/search?q=GetFileAttributesEx).