distro: Fix RHEL formatting

data/distro.yml

@@ -77,7 +77,8 @@
 
 - name: Red Hat Enterprise Linux
   logo: "redhat.svg"
-  introduction: <h2>Install Flatpak</h2>
+  introduction:
+    <h2>Install Flatpak</h2>
     <p>Flatpak is installed by default on Red Hat Enterprise Linux Workstation 9 and newer. To get started, all you need to do is enable Flathub, which is the best way to get Flatpak apps. Just download and install the <a class="btn btn-default" href="https://dl.flathub.org/repo/flathub.flatpakrepo">Flathub repository file</a>.</p>
     <p>To install Flatpak on Red Hat Enterprise Linux Workstation 8 or older, run the following in a terminal:</p>
     <!-- Apparently the GNOME Software Flatpak plugin is shipped as part of the GNOME Software package, so there’s no need to separately install it -->