Update helper docs display disable option

Updated helper docs via configure.py to make it clearer that users can control options with enable and disable

src/bootstrap/configure.py

@@ -193,7 +193,7 @@ def is_value_list(key):
         if option.value:
             print('\t{:30} {}'.format('--{}=VAL'.format(option.name), option.desc))
         else:
-            print('\t{:30} {}'.format('--enable-{}'.format(option.name), option.desc))
+            print('\t{:30} {}'.format('--enable-{}  OR  --disable-{}'.format(option.name, option.name), option.desc))
     print('')
     print('This configure script is a thin configuration shim over the true')
     print('configuration system, `config.toml`. You can explore the comments')