[Cassandra Wiki] Trivial Update of "ArchitectureOverview" by MichaelSchade

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The "ArchitectureOverview" page has been changed by MichaelSchade.
The comment on this change is: Fixed grammar and clarified text..
http://wiki.apache.org/cassandra/ArchitectureOverview?action=diff&rev1=9&rev2=10

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   * ''Async write'': sends request to any node. That node will push the data to appropriate nodes but return to client immediately
  
  
- If node down, then write to another node with a hint saying where it should be written two. Harvester every 15 min goes through and find hints and moves the data to the appropriate node
+ If the node is down, then write to another node with a hint saying where it should be written to. Harvester every 15 min goes through and find hints and moves the data to the appropriate node
  
  === Write path ===
  At write time,