docs: document new user customization options

Author: maverick1872

calendar-widget/README.md

@@ -14,6 +14,8 @@ Calendar widget for Awesome WM - slightly improved version of the `wibox.widget.
 | radius       | 8         | The popup radius                    |
 | start_sunday | false     | Start the week on Sunday            |
 | week_numbers | false     | Show ISO week numbers (Mon = first) |
+| auto_hide    | false     | Auto hide the popup after timeout   |
+| timeout      | 2         | Auto hide timeout length         |
 
  - themes: