patch beacon chain launch date

Author: wackerow

src/intl/en/learn-quizzes.json

@@ -305,8 +305,8 @@
   "h003-prompt": "When did The Merge happen?",
   "h003-a-label": "September 15th 2022",
   "h003-a-explanation": "The Merge happened on September 15th 2022 at 06:42:42 AM (UTC).",
-  "h003-b-label": "December 1st 2021",
-  "h003-b-explanation": "The Merge happened later than this. December 1st 2022 was when the Beacon Chain was launched.",
+  "h003-b-label": "December 1st 2020",
+  "h003-b-explanation": "The Merge happened later than this. December 1st 2020 was when the Beacon Chain was launched.",
   "h003-c-label": "November 27 2013",
   "h003-c-explanation": "The Merge happened later than this. November 27, 2013 was when the Ethereum whitepaper was released.",
   "h003-d-label": "October 31st 2008",