Partially fix RustScan#362: Fix examples (RustScan#363)

Include -a to specify addresses

src/input.rs

@@ -130,7 +130,7 @@ pub struct Opts {
 
  /// The Script arguments to run.
  /// To use the argument -A, end RustScan's args with '-- -A'.
- /// Example: 'rustscan -T 1500 127.0.0.1 -- -A -sC'.
+ /// Example: 'rustscan -T 1500 -a 127.0.0.1 -- -A -sC'.
  /// This command adds -Pn -vvv -p $PORTS automatically to nmap.
  /// For things like --script '(safe and vuln)' enclose it in quotations marks \"'(safe and vuln)'\"")
  #[structopt(last = true)]

src/main.rs

@@ -134,7 +134,7 @@ fn main() {
  \n Alternatively, increase the timeout if your ping is high. Rustscan -t 2000 for 2000 milliseconds (2s) timeout.\n",
  ip,
  opts.batch_size,
- "'rustscan -b <batch_size> <ip address>'");
+ "'rustscan -b <batch_size> -a <ip address>'");
  warning!(x, opts.greppable, opts.accessible);
  }