[Solr Wiki] Update of "CoreAdmin" by HossMan

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The "CoreAdmin" page has been changed by HossMan:
http://wiki.apache.org/solr/CoreAdmin?action=diff&rev1=37&rev2=38

Comment:
SOLR-3592

  
  This can be useful when (backwards compatible) changes have been made to your solrconfig.xml or schema.xml files (e.g. new `<field>` declarations, changed default params for a `<requestHandler>`, etc...) and you want to start using them without stopping and restarting your whole Servlet Container.
  
+ <<Anchor(LiveReload)>>
+ === Important Note About Some Configuration Changes ===
+ 
+ Starting with [[Solr4.0]], the RELOAD command is implemented in a way that results a "live" reloads of the SolrCore, reusing the existing various objects such as the SolrIndexWriter. As a result, some configuration options can not be changed and made active with a simple RELOAD...
+ 
+  * `IndexWriter` related settings in {{{<indexConfig>}}}
+  * {{{<dataDir>}}} location
+ 
+ See [[https://issues.apache.org/jira/browse/SOLR-3592|SOLR-3592]] for more background.
+ 
  == RENAME ==
  
  Change the names used to access a core.  The example below changes the name of the core from "core0" to "core5".