docs(storybook): add dynamic default slot

Author: iOvergaard

packages/uui-label/lib/uui-label.story.ts

@@ -9,11 +9,19 @@ export default {
   id: 'uui-label',
   title: 'Inputs/Label',
   component: 'uui-label',
+  args: {
+    slot: 'Label',
+  },
+  argTypes: {
+    slot: {
+      control: { type: 'text' },
+    },
+  },
 };
 
 const Template: Story = props => html`
   <uui-label ?disabled=${props.disabled} ?required=${props.required}
-    >Label</uui-label
+    >${props.slot}</uui-label
   >
 `;