[Solr Wiki] Trivial Update of "SolrPlugins" by ChrisHarris

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The following page has been changed by ChrisHarris:
http://wiki.apache.org/solr/SolrPlugins

The comment on the change is:
Link to UpdateRequestProcessor

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  /!\ :TODO: /!\ NEED DOCS
  
+ See ["UpdateRequestProcessor"]
+ 
  === QueryResponseWriter ===
  
  Instances of [http://lucene.apache.org/solr/docs/api/org/apache/solr/request/QueryResponseWriter.html QueryResponseWriter] define the formatting used to output the results of a request.  Multiple writers (including multiple instances of the same !QueryResponseWriter class with different configurations) can be specified in your [wiki:SolrConfigXml solrconfig.xml]...