docs(slider-label): add doc comment and element tag for CEM (#1598)

Author: damyanpetev

src/components/slider/slider-label.ts

@@ -2,6 +2,16 @@ import { LitElement, css } from 'lit';
 
 import { registerComponent } from '../common/definitions/register.js';
 
+/**
+ * Allows formatting the values of the slider as string values.
+ * The text content of the slider labels is used for thumb and tick labels.
+ *
+ * @remarks
+ * When slider labels are provided, the `min`, `max` and `step` properties are automatically
+ * calculated so that they do not allow values that do not map to the provided labels.
+ *
+ * @element igc-slider-label
+ */
 export default class IgcSliderLabelComponent extends LitElement {
   public static readonly tagName = 'igc-slider-label';
   public static override styles = css`