ra2refentry.xsl: add master/slave set examples
ra2refentry.xsl: add master/slave set examples

When a resource agent advertises both "promote" and "demote"
operations, then configuring it as a primitive, by itself, can be
expected to cause errors. Add an example master/slave set
programlisting.

(Configuring either promote or demote, but not the other, is actually
a resource agent error.)

stevenraspudic/resource-agents,stevenraspudic/resource-agents,asp24/resource-agents,asp24/resource-agents,asp24/resource-agents,stevenraspudic/resource-agents