Merge branch 'docs-kramdown-fix' into 'master'

Fixing kramdown error in docs.

Closes gitlab-docs#473

See merge request gitlab-org/gitlab!21859

doc/integration/github.md

@@ -175,7 +175,7 @@ Check the [`production.log`](../administration/logs.md#productionlog)
 on your GitLab server to obtain further details. If you are getting the error like
 `Faraday::ConnectionFailed (execution expired)` in the log, there may be a connectivity issue
 between your GitLab instance and GitHub Enterprise. To verify it, [start the rails console](https://docs.gitlab.com/omnibus/maintenance/#starting-a-rails-console-session)
-and run the commands below replacing <github_url> with the URL of your GitHub Enterprise instance:
+and run the commands below replacing `<github_url>` with the URL of your GitHub Enterprise instance:
 
 ```ruby
 uri = URI.parse("https://<github_url>") # replace `GitHub-URL` with the real one here