SOLR-4839: Re-organized upgrade notes and added notes about removing the ability to run java -jar start.jar directly and removal of SOLR_SSL_PORT property.
SOLR-4839: Re-organized upgrade notes and added notes about removing the ability to run java -jar start.jar directly and removal of SOLR_SSL_PORT property.

git-svn-id: e799fff536a883f3c27ef733fe770373e8a19271@1676127 13f79535-47bb-0310-9956-ffa450edef68

PATRIC3/p3_solr,PATRIC3/p3_solr,PATRIC3/p3_solr,PATRIC3/p3_solr,PATRIC3/p3_solr,PATRIC3/p3_solr,PATRIC3/p3_solr