[Solr Wiki] Update of "ReleaseNote55" by HossMan

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The "ReleaseNote55" page has been changed by HossMan:
https://wiki.apache.org/solr/ReleaseNote55?action=diff&rev1=3&rev2=4

Comment:
add 5.5 ref guide to release announcement

- 22 February 2016, Apache Solr™ 5.5 available
+ 22 February 2016, Apache Solr™ 5.5 and Reference Guide for 5.5 available
  
  Solr is the popular, blazing fast, open source NoSQL search platform
  from the Apache Lucene project. Its major features include powerful
@@ -45, +45 @@

  Further details of changes are available in the change log available at:
  http://lucene.apache.org/solr/5_5_0/changes/Changes.html
  
+ Also available is the Solr Reference Guide for Solr 5.5. This PDF serves as the definitive user's manual for Solr 5.5. It can be downloaded from the Apache mirror network: https://s.apache.org/Solr-Ref-Guide-PDF
+ 
  Please report any feedback to the mailing lists (http://lucene.apache.org/solr/discussion.html)
  
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