[Solr Wiki] Update of "FieldCollapsing" by elonderin

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The "FieldCollapsing" page has been changed by elonderin:
http://wiki.apache.org/solr/FieldCollapsing?action=diff&rev1=38&rev2=39

Comment:
fix group.main:If true, the result of the last field grouping command is used as the main result list in the response, using group.format=simple

  ||sort||[sortspec]||How to sort the groups relative to each other.  For example, {{{sort=popularity desc}}} will cause the groups to be sorted according to the highest popularity doc in each group.  Defaults to "score desc".||
  ||group.sort||[sortspec]||How to sort documents within a single group.  Defaults to the same value as the {{{sort}}} parameter.||
  ||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.main||true/false||If true, the result of the last 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. <!> [[Solr3.4]] Supported from Solr 3.4 and up.||
  ||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||