fix(material/slider): fix formatting

fix formatting

fixes b/286300099

Author: DBowen33

src/material/slider/slider.ts

@@ -590,7 +590,7 @@ export class MatSlider implements AfterViewInit, OnDestroy, _MatSlider {
   /**
    * Returns the translateX positioning for the end tick mark to visually
    * indicate the end of the slider
-   * */
+   */
   _calcEndTickMarkTransform(index: number): string {
     // Only show the last tick mark
     if (index === this._tickMarks.length - 1) {