Fix comment typo

Author: devversion

src/lib/dialog/dialog-container.ts

@@ -81,7 +81,7 @@ export class MatDialogContainer extends BasePortalOutlet {
 
   /**
    * Type of interaction that led to the dialog being closed. This is used to determine
-   * where the focus style will be applied when returning focus to its original location
+   * whether the focus style will be applied when returning focus to its original location
    * after the dialog is closed.
    */
   _closeInteractionType: FocusOrigin = 'program';