Update accessibility summary in about.html

Author: Gmac4247

about.html

@@ -90,7 +90,7 @@
   "alternateName": "About page",
     "accessMode": ["textual", "visual"],
 "accessibilityHazard": "none",
-"accessibilitySummary": "Mostly textual explanation with an animated figure and a video." ,
+"accessibilitySummary": "Mostly textual with videos and an animated figure.",
 "accountablePerson": {
 "@type": "Person",
 "address": {