Add info about allow-unhealthy-nodes attribute (#351)

bsc#1215886
jsc#DOCTEAM-1126

xml/ha_configuring_resources.xml

@@ -1574,14 +1574,14 @@ hostname (string): Hostname
    with the <command>crm_resource --meta</command> command or with &hawk2;.
   </para>
   <para>
-   The following resource options are available:
+   The following list shows some common options:
   </para>
   <variablelist>
    <varlistentry>
     <term><literal>priority</literal></term>
     <listitem>
      <para>
-      If not all resources can be active, the cluster stops lower-priority 
+      If not all resources can be active, the cluster stops lower-priority
       resources to keep higher-priority resources active.
      </para>
      <para>
@@ -1702,6 +1702,18 @@ hostname (string): Hostname
      </para>
     </listitem>
    </varlistentry>
+   <varlistentry>
+     <term><literal>allow-unhealthy-nodes</literal></term>
+     <listitem>
+       <para>
+        Allows the resource to run on a node even if the node's health score would otherwise
+        prevent it.
+       </para>
+       <para>
+         The default value is <literal>false</literal>.
+       </para>
+     </listitem>
+   </varlistentry>
    <varlistentry>
     <term><literal>remote-node</literal></term>
     <listitem>