Replace smart quotes with straight quotes in frontmatter (#59965)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: heiskr

content/get-started/learning-about-github/githubs-plans.md

@@ -1,5 +1,5 @@
 ---
-title: GitHub’s plans
+title: GitHub's plans
 intro: 'An overview of {% data variables.product.prodname_dotcom %}''s pricing plans.'
 redirect_from:
   - /articles/github-s-products

content/pull-requests/collaborating-with-pull-requests/working-with-forks/fork-a-repo.md

@@ -8,7 +8,7 @@ redirect_from:
   - /github/getting-started-with-github/fork-a-repo
   - /github/getting-started-with-github/quickstart/fork-a-repo
   - /get-started/quickstart/fork-a-repo
-intro: A fork is a new repository that shares code and visibility settings with the original “upstream” repository.
+intro: A fork is a new repository that shares code and visibility settings with the original upstream repository.
 permissions: '{% data reusables.enterprise-accounts.emu-permission-fork %}'
 versions:
   fpt: '*'