Use curly braces in if condition (#40865)

Co-authored-by: Sharra-writes <sharra-writes@github.com>

Author: glenthomas

content/actions/how-tos/write-workflows/choose-when-workflows-run/control-jobs-with-conditions.md

@@ -23,7 +23,7 @@ name: example-workflow
 on: [push]
 jobs:
   production-deploy:
-    if: github.repository == 'octo-org/octo-repo-prod'
+    if: ${{ github.repository == 'octo-org/octo-repo-prod' }}
     runs-on: ubuntu-latest
     steps:
       - uses: {% data reusables.actions.action-checkout %}