fixup! Add PostgreSQL upgrade instructions on EL8

_includes/manuals/2.4/3.6_upgrade.md

@@ -129,7 +129,7 @@ dnf upgrade ruby\* foreman\*
 
 Foreman runs best on PostgreSQL 12 but the default version on EL8 is 10. The installer will try to use version 12 but can't upgrade existing databases. An upgrade can be performed by [switching module streams](https://docs.fedoraproject.org/en-US/modularity/using-modules-switching-streams/).
 
-First make sure you have version 10 installed:
+First check which version of PostgreSQL is currently installed:
 
 {% highlight bash %}
 rpm -qv postgresql-server