close_range.2: Minor wording fix

Reported-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man2/close_range.2

@@ -141,7 +141,8 @@ in the caller's file descriptor table
 .I last
 is ~0U),
 the kernel will unshare a new file descriptor table for the caller up to
-.IR first .
+.IR first ,
+copying as few file descriptors as possible.
 This avoids subsequent
 .BR close (2)
 calls entirely;