fix(einstein header): fix bad annotation scoping (#4651)

Author: kflournoy-sf

ui/components/einstein-header/base/_index.scss

@@ -22,7 +22,7 @@
   /**
    * @summary Einstein themed card header figure
    * @selector .slds-einstein-header__figure
-   * @restrict .slds-einstein-header
+   * @restrict div, header
   */
   .slds-einstein-header__figure,
   .slds-einstein-header__figure:last-child {