[Solr Wiki] Update of "ReleaseNote61" by CassandraTargett

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The "ReleaseNote61" page has been changed by CassandraTargett:
https://wiki.apache.org/solr/ReleaseNote61?action=diff&rev1=4&rev2=5

Comment:
Add a few more items to release notes

  
  Solr 6.1 Release Highlights:
  
-  * Added new "sort" and "random" streaming expressions
+  * Added graph traversal support, and new "sort" and "random" streaming expressions. It's also now possible to create streaming expressions with the Solr Admin UI.
  
   * Fixed the ENUM faceting method to not be unnecessarily rewritten to FCS, which was causing slowdowns.
  
@@ -23, +23 @@

   * New [subquery] document transformer to obtatin related documents per result doc.
  
   * EmbeddedSolrServer allocates heap much wisely even with plain document list without callbacks.
+  
+  * New GeoJSON response writer for encoding geographic data in query responses.
  
  Further details of changes are available in the change log available at: http://lucene.apache.org/solr/6_1_0/changes/Changes.html