chore: update docs for infotext + migration (#856)

Author: nmerget

packages/components/src/components/alert/docs/Migration.md

@@ -7,8 +7,8 @@
 
 ### class
 
-| Before             | Status | After      | Description                                                                                                                                                                                                                                                                                                                                                                                                                                    |
-| ------------------ | :----: | ---------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| Before             | Status | After      | Description                                                                                                                                                                                                                                                                                                                                                                                                                              |
+| ------------------ | :----: | ---------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | `elm-notification` |   🔁   | `db-alert` | The old notification component has been split into 2 different components [Notification](https://marketingportal.extranet.deutschebahn.com/marketingportal/Design-Anwendungen/db-ux-design-system-v3/components/feedback/notification) and [Alert](https://marketingportal.extranet.deutschebahn.com/marketingportal/Design-Anwendungen/db-ux-design-system-v3/components/feedback/alert) for more information (when and how to use it). |
 
 ### variant ➡ type

packages/components/src/components/infotext/docs/Migration.md

@@ -0,0 +1,8 @@
+## General
+
+> **Note**
+> For a general installation or migration process check out this [documentation](https://www.npmjs.com/package/@db-ui/components).
+
+## DB UI Core ➡ DB UI Components
+
+New Component 🥳

packages/components/src/components/infotext/model.ts

@@ -2,17 +2,21 @@ import {
 	DefaultVariantProps,
 	DefaultVariantType,
 	GlobalProps,
-	GlobalState
+	GlobalState,
+	IconProps
 } from '../../shared/model';
 
 export interface DBInfotextDefaultProps {
-	icon?: string;
+	/**
+	 * The size attribute changes the font-size of the infotext and hides the icon for size="small".
+	 */
 	size?: 'medium' | 'small';
 }
 
 export type DBInfotextProps = DBInfotextDefaultProps &
 	GlobalProps &
-	DefaultVariantProps;
+	DefaultVariantProps &
+	IconProps;
 
 export interface DBInfotextDefaultState {
 	getIcon: (icon?: string, variant?: DefaultVariantType) => string;