[Solr Wiki] Update of "DistributedSearch" by OtisGospodnetic

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The "DistributedSearch" page has been changed by OtisGospodnetic.
http://wiki.apache.org/solr/DistributedSearch?action=diff&rev1=12&rev2=13

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     * No distributed idf (see http://wunderwood.org/most_casual_observer/2007/04/progressive_reranking.html ) (Also see https://issues.apache.org/jira/browse/SOLR-1632 for some new work on this feature.)
     * Doesn't support !QueryElevationComponent
     * The index could change between stages, e.g. a document that matched a query and was subsequently changed may no longer match but will still be retrieved.
-    * Doesn't currently support date faceting
+    * Doesn't currently support date faceting (see https://issues.apache.org/jira/browse/SOLR-1709 )
     * Currently only supports sorted field facets (Solr 1.4+ supports both)
     * Number of shards is limited by number of characters allowed for GET method's URI; most web servers generally support at least 4000 characters, but limit still exists to prevent denial-of-service attacks.
     * Makes it more inefficient to use a high "start" parameter. For example, if you request start=500000&rows=25 on an index with 500,000+ docs per shard, this will currently result in 500,000 records getting sent over the network from the shard to the coordinating Solr instance. If you had a single-shard index, in contrast, only 25 records would ever get sent over the network. (Granted, setting start this high is not something many people need to do.)