[Solr Wiki] Update of "CollectionDistribution" by JoseQ

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The following page has been changed by JoseQ:
http://wiki.apache.org/solr/CollectionDistribution

The comment on the change is:
-d specifies directory, I think the author meant -D, the number of snapshots

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  For example, the following cron job runs everyday at midnight and cleans up snapshots 8 days and older:
  
  {{{
- 0 0 * * * <solr.solr.home>/solr/bin/snapcleaner -d 7
+ 0 0 * * * <solr.solr.home>/solr/bin/snapcleaner -D 7
  }}}
  
  Additional cleanup can always be performed on-demand by running '''snapcleaner''' manually.