[Solr Wiki] Update of "SolrCloud" by Mark Miller

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The "SolrCloud" page has been changed by Mark Miller:
http://wiki.apache.org/solr/SolrCloud?action=diff&rev1=69&rev2=70

  SolrCloud is the name of a set of new distributed capabilities in Solr. Passing parameters to enable these capabilities will enable you to set up a highly available, fault tolerant cluster of Solr servers. Use SolrCloud when you want high scale, fault tolerant, distributed indexing and search capabilities.
  
  Look at the following 'Getting Started' section to quickly learn how to start up a cluster. There are 3 quick examples to follow, each showing how to startup a progressively more complicated cluster. After checking out the examples, consult the following sections for more detailed information as needed.
+ 
+ === A little about SolrCores and Collections ===
+ On a single instance, Solr has something called a SolrCore that is essentially a single index. If you want multiple indexes, you create multiple SolrCores. With SolrCloud, a single index can span multiple Solr instances. This means that a single index can be made up of multiple SolrCore's on different machines. We call all of these SolrCores that make up one logical index a collection. A collection is a essentially a single index that spans many SolrCore's, both for index scaling as well as redundancy. If you wanted to move your 2 SolrCore Solr setup to SolrCloud, you would have 2 collections, each made up of multiple individual SolrCores.
  
  == Getting Started ==
  Download Solr 4-Beta or greater: http://lucene.apache.org/solr/downloads.html