Add missing backtick to make it a command

Fixes: 04bf575 ("Add a rel_eng_script macro in procedures")

procedures/katello/branch.md.erb

@@ -60,7 +60,7 @@
 - [] Bump Katello related packages to their next versions
   - [] [packaging](https://github.com/theforeman/foreman-packaging/pull/8729/files)
 - [ ] Generate and post the release procedure, if not already posted:
-  - [ ] Use <%= rel_eng_script('procedure_release') %>: `PROJECT=katello VERSION=<%= release %> ./procedure_release "<%= target_date %>" "<%= owner %>" "<%= engineer %>"
+  - [ ] Use <%= rel_eng_script('procedure_release') %>: `PROJECT=katello VERSION=<%= release %> ./procedure_release "<%= target_date %>" "<%= owner %>" "<%= engineer %>"`
   - [ ] Post the output in [Development/Releases](https://community.theforeman.org/c/development/releases/20) using `Katello <%= release %>.0-rc1 release process`
   - [ ] Clone https://github.com/theforeman/apidocs and follow the Katello README section to update the API documentation.
 - [ ] Prepare "Katello Next" and future redmine versions