refactor: guidelines 3.0 radio style

docs/migrationGuide.adoc

@@ -38,7 +38,7 @@ We've remove the deprecated previous HTML implementation of the label by an `out
 
 === `input`
 
-- The input background style variations `semitransparent`, `solid`, `white` and `outline` have been removed. Input fields have only one background style left. 
+- The input background style variations `semitransparent`, `solid`, `white` and `outline` have been removed. Input fields have only one background style left.
 - Introducing 3 different sizes of input fields according to our `tonality` introduction: `functional`, `regular`, `expressive
 - Integration of `data-icon-before` and `data-icon-after` property for enabling use of custom icons in input fields
 - Introducing new variations: `error`, `warning`, `success` and `information` following the new guidelines 3.0 color system
@@ -50,6 +50,11 @@ We've remove the deprecated previous HTML implementation of the label by an `out
 - Changed use of `data-variant` to use with `primary` and used `data-content` attribute for differentiation between `internal` and `external`
 - Font-size definition has moved to DB UI Base due to our `tonality` introduction (default and for `data-size=small`)
 
+=== `radio`
+
+- Introducing 3 different sizes of radio elements according to our `tonality` introduction: `functional`, `regular`, `expressive
+- Additionally to set the size via `tonality`, we've even also introduced a `size` setting for the radios, with which you could decrease the size by one level
+
 == DB UI Core 2.2.0 Migration Guide
 
 === progress element