[Solr Wiki] Update of "DocValues" by SteveRowe

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The "DocValues" page has been changed by SteveRowe:
http://wiki.apache.org/solr/DocValues?action=diff&rev1=2&rev2=3

Comment:
Mention prerequisite SchemaCodecFactory when using per-field doc values formats

    {{{<field name="specialCodes" type="int" indexed="false" stored="false" multiValued="true" docValues="true"/>}}}
  
  = Specifying a different Codec implementation =
-  . You can specify the {{{docValuesFormat}}} attribute on the fieldType to control the underlying implementation. Note that only the default implementation is supported by future version of Lucene: if you try an alternative format, you may need to switch back to the default and rewrite your index (e.g. forceMerge) before upgrading.
+ 
+ You can specify the {{{docValuesFormat}}} attribute on the fieldType to control the underlying implementation. 
+ 
+ To enable per-field DocValues formats, {{{SchemaCodecFactory}}} must be configured in [[http://wiki.apache.org/solr/SolrConfigXml#codecFactory|solrconfig.xml]]:
+ 
+  {{{
+  <codecFactory class="solr.SchemaCodecFactory"/>
+  }}} 
+ 
+ /!\ Note that only the default implementation is supported by future version of Lucene: if you try an alternative format, you may need to switch back to the default and rewrite your index (e.g. forceMerge) before upgrading.
  
   * {{{docValuesFormat="Lucene42"}}}: This is the default, which loads everything into heap memory.
   * {{{docValuesFormat="Disk"}}}: This implementation has a different layout, to try to keep most data on disk but with reasonable performance.
@@ -89, +98 @@

  
  Example of altering the codec implementation:
  
- {{{
+  {{{
-   <fieldType name="string_disk" class="solr.StrField" docValuesFormat="Disk" />
+  <fieldType name="string_disk" class="solr.StrField" docValuesFormat="Disk" />
- }}}
+  }}}