[Solr Wiki] Update of "SolrCloud" by Pulkit Singhal

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The "SolrCloud" page has been changed by Pulkit Singhal:
http://wiki.apache.org/solr/SolrCloud?action=diff&rev1=38&rev2=39

Comment:
Added a crucial note about state of SolrCloud and the examples

  
  === Example B: Simple two shard cluster with shard replicas ===
  This example will simply build off of the previous example by creating another copy of shard1 and shard2.  Extra shard copies can be used for high availability and fault tolerance, or simply for increasing the query capacity of the cluster.
+ 
+ Note: This setup leverages copy/paste to setup 2 cores per shard and distributed searches validate a succesful completion of this example/exercise. But DO NOT assume that any new data that you index will be distributed across and indexes at each core of a given shard. That will not happen. Distributed Indexing is not part of SolrCloud yet. You may however adapt a basic implementation of distributed indexing by referring to [[https://issues.apache.org/jira/browse/SOLR-2355|SOLR-2355]].
  
  First, run through the previous example so we already have two shards and some documents indexed into each.  Then simply make a copy of those two servers: