[Cassandra Wiki] Update of "ArchitectureOverview" by GehrigKunz

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The "ArchitectureOverview" page has been changed by GehrigKunz:
https://wiki.apache.org/cassandra/ArchitectureOverview?action=diff&rev1=14&rev2=15

Comment:
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  You get consistency if R + W > N, where R is the number of records to read, W is the number of records to write, and N is the replication factor.  A !ConsistencyLevel of ONE means R or W is 1.  A !ConsistencyLevel of QUORUM means R or W is ceiling((N+1)/2).  A !ConsistencyLevel of ALL means R or W is N.  So if you want to write with a !ConsistencyLevel of ONE and then get the same data when you read, you need to read with !ConsistencyLevel ALL.
  
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