zypper up is not recommended (#69)

* zypper up is not recommended

bsc#1216869
DOCTEAM-1215

* Clarify slurm major version

xml/slurm.xml

@@ -880,6 +880,19 @@ Description="subgroup" Organization=bavaria</screen>
     upgrades are not installed unintentionally and gives you the opportunity
     to plan version upgrades beforehand.
    </para>
+   <important>
+     <title><command>zypper up</command> is not recommended</title>
+     <para>
+       On systems running &slurm;, updating packages with <command>zypper up</command>
+       is not recommended. <command>zypper up</command> attempts to update all installed
+       packages to the latest version, so might install a new major version of &slurm;
+       outside of planned &slurm; upgrades.
+     </para>
+     <para>
+       Use <command>zypper patch</command> instead, which only updates packages to the
+       latest bug fix version.
+     </para>
+   </important>
   <sect2 xml:id="sec-slurm-upgrade-workflow">
    <title>&slurm; upgrade workflow</title>
    <para>