[Solr Wiki] Update of "ReleaseNote73" by CassandraTargett

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The "ReleaseNote73" page has been changed by CassandraTargett:
https://wiki.apache.org/solr/ReleaseNote73?action=diff&rev1=4&rev2=5

Comment:
Add detail about autoscaling & OpenNLP changes

  See http://lucene.apache.org/solr/7_3_0/changes/Changes.html for a full list of details.
  
  == Solr 7.3.0 Release Highlights: ==
-  * A new update request processor supports OpenNLP-based entity extraction
+  * A new update request processor supports OpenNLP-based entity extraction and language detection
   * Support for automatic time-based collection creation
   * Multivalued primitive fields can now be used in sorting
   * A new !SortableTextField allows both indexing and sorting/faceting on free text
   * Several new stream evaluators
   * Improvements around leader-initiated recovery
-  * New autoscaling features
+  * New autoscaling features: triggers can perform operations based on any metric available from the Metrics API, based on a defined schedule, or in response to a query rate over a 1-minute average. A new screen in the Admin UI will show suggested autoscaling actions.
   * Metrics can now be exported to Prometheus
   * {!parent} and {!child} support filtering with exclusions via new local parameters
   * Introducing {!filters} query parser for referencing filter queries and excluding them