chore: punctuation patch

Author: wackerow

src/intl/en/page-index.json

@@ -120,7 +120,7 @@
   "page-index-join-action-contribute-description": "Find out all the different ways you can help ethereum.org grow and be better.",
   "page-index-join-action-contribute-label": "How to contribute",
   "page-index-join-action-discord-description": "To ask questions, coordinate contribution and join community calls.",
-  "page-index-join-action-github-description": "Contribute to code, content, articles etc.",
+  "page-index-join-action-github-description": "Contribute to code, content, articles, etc.",
   "page-index-join-action-twitter-description": "To keep up with our updates and important news.",
   "page-index-join-description": "This website is open source with hundreds of community contributors. You can propose edits to any of the content on this site.",
   "page-index-join-header": "Join ethereum.org",