v2019.4: Release notes

Rendered here: https://em.pages.apertis.org/apertis-website/

Links are broken, so here are the pages involved:

• https://em.pages.apertis.org/apertis-website/release/v2019.4/releasenotes/
• https://em.pages.apertis.org/apertis-website/release/v2019.5/release_schedule/
• https://em.pages.apertis.org/apertis-website/policies/releases/

content/release/v2019.4/releasenotes.md

@@ -87,8 +87,8 @@ images.
 
 ### Apertis infrastructure tools
 
-The [Apertis v2019 infrastructure
-repository](https://build.collabora.co.uk/project/users/apertis:infrastructure:v2019)
+The
+[Apertis v2019 infrastructure repository](https://build.collabora.co.uk/project/users/apertis:infrastructure:v2019)
 provides packages for the required versions of `ostree-push` and
 `ostree` for Debian Buster: