[Solr Wiki] Update of "FieldCollapsing" by YonikSeeley

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The "FieldCollapsing" page has been changed by YonikSeeley.
The comment on this change is: spell out limitations.
http://wiki.apache.org/solr/FieldCollapsing?action=diff&rev1=25&rev2=26

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  Notes:
   * Any number of group commands (group.field, group.func, group.query) may be specified in a single request.
+ 
+ 
+ = Known Limitations =
   * Distributed search support for result grouping has not yet been implemented.
+  * Support for missing values (groupValue=null) has not yet been implemented.
+  * Support for grouping on a multi-valued field has not yet been implemented.
+  * Support for faceting after collapsing has not been implemented (faceting works like normal, with grouping having no effect)
+  * Further performance improvements are planned soon!