docs: correct the description of menuItemSelectedIcon (#625)

Author: lc-soft

README.md

@@ -123,7 +123,7 @@ export default () => (
 | inputIcon | specify the select arrow icon | ReactNode | - |
 | clearIcon | specify the clear icon | ReactNode | - |
 | removeIcon | specify the remove icon | ReactNode | - |
-| menuItemSelectedIcon | specify the remove icon | ReactNode \| (props: MenuItemProps) => ReactNode | - |
+| menuItemSelectedIcon | specify the item selected icon | ReactNode \| (props: MenuItemProps) => ReactNode | - |
 | dropdownRender | render custom dropdown menu | (menu: React.Node, props: MenuProps) => ReactNode | - |
 | loading | show loading icon in arrow | Boolean | false |
 | virtual | Disable virtual scroll | Boolean | true |