Update library/std/src/fs.rs

Co-authored-by: Marijn Schouten <hkBst@users.noreply.github.com>

Author: sftse

library/std/src/fs.rs

@@ -2667,7 +2667,7 @@ pub fn symlink_metadata<P: AsRef<Path>>(path: P) -> io::Result<Metadata> {
 ///
 /// Because of this, the behavior when both `from` and `to` exist differs. On
 /// Unix, if `from` is a directory, `to` must be an empty directory or non-existent. If
-/// `from` is not a directory, `to` must also be not a directory. The behavior
+/// `from` is not a directory, `to` must also not be a directory. The behavior
 /// on Windows is the same on Windows 10 1607 and higher if `FileRenameInfoEx`
 /// is supported by the filesystem; otherwise, `from` can be anything, but
 /// `to` must *not* be a directory.