When will the setting docstr-format-var property change to the new value?

The default value of the `docstr-format-var` property is `"- %s:"`. 

After this setting,  but the value does not change to `"- Parameter %s:"`

``` elisp
(after! docstr
  (setq! docstr-desc-summary "[描述]")
  (setq! docstr-desc-param "[属性]")
  (setq! docstr-desc-return "[返回值]")
  (setq! docstr-format-var "- Parameter %s:")
  )
```
https://emacs-china.org/t/topic/19243