File _patchinfo of Package patchinfo.456

<patchinfo incident="456">
  <issue id="918565" tracker="bnc">XML Catalog Issues in Several DocBook Packages</issue>
  <category>recommended</category>
  <rating>low</rating>
  <packager>thomas-schraitle</packager>
  <description>This update for DocBook 4 fixes a subtle XML catalog bug.</description>
  <summary>Recommended update for docbook_4</summary>
</patchinfo>