Fix code block definition (#4378)

Refs #4262

(cherry picked from commit 8bf12ce)

Author: maximiliankolb

guides/common/modules/proc_increasing-host-limit-for-pull-based-rex-transport.adoc

@@ -13,7 +13,7 @@ For more information, see {InstallingSmartProxyDocURL}configuring-pull-based-tra
 .Procedure
 . On your {SmartProxy}, set the upper limit of connected hosts for pull-based remote execution in `/etc/foreman-installer/custom-hiera.yaml`:
 +
-[options="nowrap", subs="+quotes,verbatim,attributes"]
+[source, yaml, options="nowrap", subs="+quotes,verbatim,attributes"]
 ----
 systemd::dropin_files:
   limits.conf:
@@ -22,7 +22,7 @@ systemd::dropin_files:
 ----
 . Re-run the installer for the changes to take effect:
 +
-[source, yaml, options="nowrap", subs="+quotes,verbatim,attributes"]
+[options="nowrap", subs="+quotes,verbatim,attributes"]
 ----
 # {foreman-installer}
 ----