fix per Pa11y test result (#16943)

Co-authored-by: Chiedo John <2156688+chiedo@users.noreply.github.com>

Author: vanessayuenn

layouts/product-landing.html

@@ -42,6 +42,7 @@ <h1 class="mb-3 font-mktg">
             <div class="col-12 col-lg-6">
               <div class="position-relative" style="padding-bottom:56.25%;">
                 <iframe
+                  title="{{ page.shortTitle }} Video"
                   class="top-0 left-0 position-absolute box-shadow-large rounded-1 width-full height-full"
                   src="{{ page.product_video }}"
                   frameborder="0"