docs(alert): alert input label is only for radio/checkbox (#26923)

Resolves #26915

core/src/components/alert/alert-interface.ts

@@ -31,6 +31,9 @@ export interface AlertInput {
   name?: string;
   placeholder?: string;
   value?: any; // TODO(FW-2832): type
+  /**
+   * The label text to display next to the input, if the input type is `radio` or `checkbox`.
+   */
   label?: string;
   checked?: boolean;
   disabled?: boolean;