command-line.startup: add note about -run=listener and -run=ui.tools to the --help text (as suggested by @yac in issue #94)

basis/command-line/startup/startup.factor

@@ -12,6 +12,8 @@ Common arguments:
     -help            print this message and exit
     -i=<image>       load Factor image file <image> (default """ write vm file-name write """.image)
     -run=<vocab>     run the MAIN: entry point of <vocab>
+        -run=listener    run terminal listener
+        -run=ui.tools    run Factor development UI
     -e=<code>        evaluate <code>
     -no-user-init    suppress loading of .factor-rc