[Solr Wiki] Update of "SolrPlugins" by HossMan

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The "SolrPlugins" page has been changed by HossMan.
The comment on this change is: missleading info about SolrEventListener (also postCommit postOptimize).
http://wiki.apache.org/solr/SolrPlugins?action=diff&rev1=40&rev2=41

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      <documentCache     class="my.package.AlternateCustomCache" size="512"  />
  }}}
  === SolrEventListener ===
- Instances of the [[http://lucene.apache.org/solr/docs/api/org/apache/solr/core/SolrEventListener.html|SolrEventListener]] Interface can be configured in your [[SolrConfigXml|solrconfig.xml]] to be be executed any time specific events occur within Solr (currently, the only events that can be "listened" for are `firstSearcher` and `newSearcher`)...
+ Instances of the [[http://lucene.apache.org/solr/docs/api/org/apache/solr/core/SolrEventListener.html|SolrEventListener]] Interface can be configured in your [[SolrConfigXml|solrconfig.xml]] to be be executed any time specific events occur within Solr.
+ 
+ `firstSearcher` and `newSearcher` events trigger the `newSearcher()` method with the appropriate args, `postCommit` and `postOptimize` events will trigger the `postCommit()` method...
  
  {{{
      <listener event="newSearcher" class="my.package.CustomEventListener">