[Cassandra Wiki] Update of "FrontPage" by JonathanEllis

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The "FrontPage" page has been changed by JonathanEllis:
https://wiki.apache.org/cassandra/FrontPage?action=diff&rev1=116&rev2=117

Comment:
explain docs/wiki dichotomy

  = Apache Cassandra Wiki =
  {{{#!wiki red/solid
+ The official Cassandra documentation is located [[http://cassandra.apache.org/doc/latest/|here]].  Patches to the documentation [[https://github.com/apache/cassandra/tree/trunk/doc|can be submitted with git]]; this wiki is intended instead to document Cassandra internals and how to edit them.
+ 
  If you would like to contribute to this wiki, please send an email to the mailing list dev.at.cassandra.apache-dot-org with your wiki username and we will be happy to add you. Contributions welcome!
  }}}
  Cassandra is a highly scalable, eventually consistent, distributed, structured key-value store. Cassandra brings together the distributed systems technologies from [[http://s3.amazonaws.com/AllThingsDistributed/sosp/amazon-dynamo-sosp2007.pdf|Dynamo]] and the log-structured storage engine from Google's [[http://research.google.com/archive/bigtable-osdi06.pdf|BigTable]].