[Solr Wiki] Trivial Update of "FieldCollapsing" by martijn

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The "FieldCollapsing" page has been changed by martijn.
The comment on this change is: Add warning about memory issues with field collapse cache.
http://wiki.apache.org/solr/FieldCollapsing?action=diff&rev1=16&rev2=17

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  }}}
  Note that we have not included "query" in the list of component; the collapse handler implements query functionality itself.
  
- In the latest patch it is possible to configure caching for the field collapsing execution. This is an extra cache in addition
+ In the latest patch it is possible to configure caching for the field collapsing execution. There are memory issues with this cache.
+ Its therefore recommend to keep this cache small (e.g. with size 20) or to disable this cache. How big the cache should be depends on your environment.
+ 
+ This is an extra cache in addition
  to the already existing caches. It caches the result of the collapse logic and configured collapse collectors.
  The following xml configuration can be placed inside the solrconfig.xml as child of the config element.
  {{{