OSDOCS-14979: fixes unrendered attributes MicroShift updates 4.19

Author: ShaunaDiaz

modules/microshift-updates-rhde-config-rhel-repos.adoc

@@ -18,15 +18,14 @@ When using RPM updates, avoid creating an unsupported configuration or breaking
 
 . Avoid unintended updates by locking your operating system version by running the following command:
 +
-[source,terminal,subs="+quotes"]
+[source,terminal,subs="attributes+"]
 ----
-$ sudo subscription-manager release --set=_<x.y>_ # <1>
+$ sudo subscription-manager release --set={op-system-version}
 ----
-<1> Replace _<x.y>_ with the major and minor version of your compatible {op-system-base} system. For example, _9.6_.
 
 . If you are using an EUS {microshift-short} release, disable the {op-system-base} standard-support-scope repositories by running the following command:
 +
-[source,terminal]
+[source,terminal,subs="attributes+"]
 ----
 $ sudo subscription-manager repos \
     --disable=rhel-{op-system-version-major}-for-$(uname -m)-appstream-rpms \ # <1>
@@ -36,7 +35,7 @@ $ sudo subscription-manager repos \
 
 . After you disable the standard-support repositories, enable the {op-system-base} EUS repos by running the following command:
 +
-[source,terminal]
+[source,terminal,subs="attributes+"]
 ----
 $ sudo subscription-manager repos \
     --enable rhel-{op-system-version-major}-for-$(uname -m)-appstream-eus-rpms \  # <1>