[Lucene-java Wiki] Update of "ReleaseNote50" by DavidSmiley

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The "ReleaseNote50" page has been changed by DavidSmiley:
https://wiki.apache.org/lucene-java/ReleaseNote50?action=diff&rev1=7&rev2=8

Comment:
Fix/remove reference to DateRangeField

   * NormsFormat now gets its own dedicated NormsConsumer/Producer
   * SortedSetSortField, used to sort on a multi-valued field, is promoted from sandbox to Lucene's core.
   * PostingsFormat now uses a "pull" API when writing postings, just like doc values. This is powerful because you can do things in your postings format that require making more than one pass through the postings such as iterating over all postings for each term to decide which compression format it should use.
-  * New DateRangeField type enables Indexing and searching of date ranges, particularly multi-valued ones.
+  * New NumberRangePrefixTreeStrategy & DateRangePrefixTree in the spatial module enables indexing and searching of date ranges, particularly multi-valued ones.
   * A new ExitableDirectoryReader extends FilterDirectoryReader and enables exiting requests that take too long to enumerate over terms.
   * Suggesters from multi-valued field can now be built as DocumentDictionary now enumerates each value separately in a multi-valued field.
   * ConcurrentMergeScheduler detects whether the index is on SSD or not and does a better job defaulting its settings. This only works on Linux for now; other OS's will continue to use the previous defaults (tuned for spinning disks).