Fix a typo in an example (#13548)

Accidentally used the old name of the command, `random bytes`, instead
of the correct one.

Co-authored-by: Andrej Kolčin <self@kaathewise.net>

crates/nu-command/src/random/binary.rs

@@ -45,7 +45,7 @@ impl Command for SubCommand {
     fn examples(&self) -> Vec<Example> {
         vec![Example {
             description: "Generate 16 random bytes",
-            example: "random bytes 16",
+            example: "random binary 16",
             result: None,
         }]
     }