[Solr Wiki] Trivial Update of "ExtractingRequestHandler " by MarcGhorayeb

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The "ExtractingRequestHandler" page has been changed by MarcGhorayeb.
http://wiki.apache.org/solr/ExtractingRequestHandler?action=diff&rev1=58&rev2=59

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  If you want to set a '''multiValued''' field, use the 
''ModifiableSolrParams'' class like this:
  {{{
- p = new ModifiableSolrParams();
+ ModifiableSolrParams p = new ModifiableSolrParams();
  for(String value : values) {
      p.add(ExtractingParams.LITERALS_PREFIX + "field", value);
  }