[Solr Wiki] Update of "UpdateXmlMessages" by JasonRuthe rglen

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The "UpdateXmlMessages" page has been changed by JasonRutherglen:
http://wiki.apache.org/solr/UpdateXmlMessages?action=diff&rev1=20&rev2=21

     * `maxSegments = N`   — default is '1' — optimizes down to at 
most this number of segments <!> [[Solr1.3]]
     * `waitFlush = "true" | "false"`  &#8212; default is true   &#8212;  block 
until index changes are flushed to disk  
     * `waitSearcher = "true" | "false"`   &#8212;  default is true  &#8212;  
block until a new searcher is opened and registered as the main query searcher, 
making the changes visible.
+    * `expungeDeletes = "true" | "false"`   &#8212;  default is false  &#8212; 
 merge segments with deletes away. <!> [[Solr1.4]]
  
  Example of "commit" and "optimize" with optional attributes:
     {{{
  <commit waitFlush="false" waitSearcher="false"/>
+ <commit waitFlush="false" waitSearcher="false" expungeDeletes="true"/>
  <optimize waitFlush="false" waitSearcher="false"/>
  }}}