Small fixes to history example

examples/history.rs

@@ -16,7 +16,7 @@ fn main() -> io::Result<()> {
     let mut target = String::new();
     let mut record = History::new();
     loop {
-        println!("Enter a string to edit. Use '-' to undo, '+' to redo, and '! i-j' for goto: ");
+        println!("Enter a string to edit. Use '<' to undo, '>' to redo, and '! i-j' for goto: ");
         let mut string = String::new();
         let n = stdin.read_line(&mut string)?;
         if n == 0 {
@@ -38,7 +38,7 @@ fn main() -> io::Result<()> {
                 if let (Some(root), Some(index)) = (at.next(), at.next()) {
                     record.go_to(&mut target, At::new(root, index));
                 } else {
-                    println!("Expected input as '! i-j', e.g. '! 1-5'.\n");
+                    println!("Expected input as '! i-j', e.g. '! 1-5'.");
                 }
                 break;
             } else if c == '<' {