apertis_packaging_guide: Fix syntax error

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>

content/guides/apertis_packaging_guide.md

@@ -442,7 +442,7 @@ Branches:
   Apertis, including the `debian/apertis/gitlab-ci.yaml` to set up the
   GitLab-to-OBS pipeline
 * `apertis/$APERTIS_RELEASE-security` and `apertis/$APERTIS_RELEASE-updates`
-  (for intance, `apertis/v2019-updates`): similar to ``apertis/$APERTIS_RELEASE`
+  (for intance, `apertis/v2019-updates`): similar to `apertis/$APERTIS_RELEASE`
   but respectively target the Security and Updates repositories for published
   stable releases as described in [Process after a product
   release]( {{< ref "release-flow.md#process-after-a-product-release" >}} )