[Cassandra Wiki] Update of "Operations" by AlexisLeQuoc

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The "Operations" page has been changed by AlexisLeQuoc.
The comment on this change is: Added instructions to change the replication factor on a live cluster.
http://wiki.apache.org/cassandra/Operations?action=diff&rev1=85&rev2=86

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  The same options apply to changing replication strategy.
  
  Reducing replication factor is easily done and only requires running cleanup afterwards to remove extra replicas.
+ 
+ To update the replication factor on a live cluster, forget about cassandra.yaml. Rather you want to use '''cassandra-cli''':
+     update keyspace Keyspace1 set replication_factor = 3;
  
  === Network topology ===
  Besides datacenters, you can also tell Cassandra which nodes are in the same rack within a datacenter.  Cassandra will use this to route both reads and data movement for Range changes to the nearest replicas.  This is configured by a user-pluggable !EndpointSnitch class in the configuration file.