add topic frontmatter to articles (#18245)

content/github/developing-online-with-codespaces/managing-gpg-verification-for-codespaces.md

@@ -1,9 +1,11 @@
 ---
 title: Managing GPG verification for Codespaces
-intro: You can allow {% data variables.product.company_short %} to automatically use GPG to sign commits you make in your codespaces, so other people can be confident that the changes come from a trusted source.
+intro: 'You can allow {% data variables.product.company_short %} to automatically use GPG to sign commits you make in your codespaces, so other people can be confident that the changes come from a trusted source.'
 product: '{% data reusables.gated-features.codespaces %}'
 versions:
   free-pro-team: '*'
+topics:
+  - codespaces
 ---
 
 {% note %}