docs: Update definition for dashed button (ant-design#44481)

This updates the English documentation for the dashed button.

This updates the English to better translate the [Chinese version](https://github.com/ant-design/ant-design/blob/345a3a0624c18b4eceb130dd3fd20b64de11976b/components/button/index.zh-CN.md).

(I'm assuming the Chinese version is normative.)

Signed-off-by: William Entriken <github.com@phor.net>

components/button/index.en-US.md

@@ -20,7 +20,7 @@ In Ant Design we provide 5 types of button.
 
 - Primary button: indicate the main action, one primary button at most in one section.
 - Default button: indicate a series of actions without priority.
-- Dashed button: used for adding action commonly.
+- Dashed button: commonly used for adding more actions.
 - Text button: used for the most secondary action.
 - Link button: used for external links.