[Solr Wiki] Update of "FieldCollapsing" by martijnvg

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The "FieldCollapsing" page has been changed by martijnvg:
http://wiki.apache.org/solr/FieldCollapsing?action=diff&rev1=34&rev2=35

  ||group.format||grouped/simple||if simple, the grouped documents are presented in a single flat list.  The start and rows parameters refer to numbers of documents instead of numbers of groups.||
  ||group.main||true/false||If true, the result of the first field grouping command is used as the main result list in the response, using group.format=simple||
  ||group.ngroups||true/false||If true, includes the number of groups that have matched the query. Default is false.||
+ ||group.truncate||true/false||If true, facet counts are based on the most relevant document of each group matching the query. Same applies for StatsComponent. Default is false.||
  ||group.cache.percent||[0-100]||If > 0 enables grouping cache. Grouping is executed actual two searches. This option caches the second search. A value of 0 disables grouping caching. Default is 0. Tests have shown that this cache only improves search time with boolean queries, wildcard queries and fuzzy queries. For simple queries like a term query or a match all query this cache has a negative impact on performance||