[Solr Wiki] Update of "CollectionDistribution" by NicolasLalevée

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

The comment on the change is:
fix spell mistake

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  == Snapshot Directories ==
  
- Snapshots directories are in the format, snaphost.''yyyymmddHHMMSS''.
+ Snapshots directories are in the format, snapshot.''yyyymmddHHMMSS''.
  
  All the files in the index directory are hard links to the latest snapshot. This technique has these advantages:
     * Can keep multiple snapshots on each host without the need to keep multiple copies of index files that have not changed.