config_ui: Always point out that the script can operate on the ENV

private/lib/uis/config_ui.py

@@ -1,6 +1,9 @@
 import argparse
 import lib.cwd
 
-argparser = argparse.ArgumentParser(description='Tilde administration tools ', conflict_handler="resolve")
+argparser = argparse.ArgumentParser(description='Tilde administration tools ',
+                                    conflict_handler="resolve")
 argparser.add_argument('-c', '--config', default=lib.cwd.cwd,
-                       type=str, help='Path to configuration file', required=False)
+                       type=str,
+                       help='Path to configuration file. If not set, we look for it in $TILDE_CONF',
+                       required=False)