[Solr Wiki] Update of "ReleaseNote64" by DavidSmiley

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The "ReleaseNote64" page has been changed by DavidSmiley:
https://wiki.apache.org/solr/ReleaseNote64?action=diff&rev1=7&rev2=8

Comment:
Unified Highlighter changes

  * New generic authentication plugins: 'GenericHadoopAuthPlugin' and 'ConfigurableInternodeAuthHadoopPlugin' that delegate all functionality to Hadoop authentication framework
  
  Query / QueryParser / Highlighting:
+ * A new highlighter: The Unified Highlighter.  Try it via `hl.method=unified`; many popular highlighting parameters / features are supported.  It's the highest performing highlighter, especially for large documents.  Highlighting phrase queries and exotic queries are supported equally as well as the Original Highlighter (aka the default/standard one).  Please use this new highlighter and report issues since it will likely become the default one day.
- * A new highlighter: 'UnifiedSolrHighlighter', adapter for the new Lucene's UnifiedHighlighter.
- * The 'UnifiedSolrHighlighter' supports hl.requireFieldMatch and hl.fragSize (to avoid snippets/Passages that are too small).
  * Leading wildcard in complexphrase query parser are now accepted and optimized with the `ReversedWildcardFilterFactory` when it's provided
  
  Metrics: