[Solr Wiki] Update of "DisMaxRequestHandler" by JanHoydahl

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The "DisMaxRequestHandler" page has been changed by JanHoydahl:
https://wiki.apache.org/solr/DisMaxRequestHandler?action=diff&rev1=30&rev2=31

Comment:
Point to ref Guide

- The DisMaxRequestHandler (aka : DisMax) was designed to process simple user entered phrases (without heavy syntax) and search for the individual words across several fields using different weighting (boosts) based on the significance of each field.  Additional options let you influence the score based on rules specific to each use case (independent of user input)
+ In earlier versions of Solr, there was both a <queryParser> named “dismax” as well as a <requestHandler> named “dismax”, setting the defType parameter to “dismax”. This caused some confusion so it was removed in 3.1 (see https://issues.apache.org/jira/browse/SOLR-2363).
  
- As of Solr 1.3, the DisMaxRequestHandler is the exact same thing as the SearchHandler with the default query parser set to the [[DisMaxQParserPlugin]] (defType=dismax).
+ To learn more about !DisMax, please see the official Solr Reference Guide: https://cwiki.apache.org/confluence/display/solr/The+DisMax+Query+Parser
  
- If you found a link to this page somewhere, you most likely want to be reading these pages instead:
-    * DisMax (for background information on the concepts)
-    * [[DisMaxQParserPlugin]] (for details on dismax syntax and request parameters)
- 
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- CategorySolrRequestHandler
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