[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=74&rev2=75

  
  The Grouping feature only works if groups are in the same shard. Proper support will require custom hashing and there is already a JIRA issue working towards this.
  
+ == Glossary ==
+ 
+ Collection: A single search index.
+ Shard: Either a logical or physical section of a single index depending on context. A logical section is also called a slice. A physical shard is expressed as a SolrCore.
+ Slice: A logical section of a single index. One or more identical, physical shards make up a slice.
+ SolrCore: Encapsulates a single physical index. One or more make up logical shards (or slices) which make up a collection.
+ Node: A single instance of Solr. A single Solr instance can have multiple SolrCores that can be part of any number of collections.
+ Cluster: All of the nodes you are using to host SolrCores.
+ 
  == FAQ ==
  
   * '''Q:''' I'm seeing lot's of session timeout exceptions - what to do?