Fix broken link in CI quickstart docs

The space between the [label] and the (link) caused it to be interpreted literally.

doc/ci/quick_start/README.md

@@ -212,8 +212,8 @@ If you want to receive e-mail notifications about the result status of the
 builds, you should explicitly enable the **Builds Emails** service under your
 project's settings.
-For more information read the [Builds emails service documentation]
-(../../project_services/builds_emails.md).
+For more information read the
+[Builds emails service documentation](../../project_services/builds_emails.md).
 ## Builds badge