Release notes for MySQL Server and associated products are no longer published in the MySQL Reference Manual. Instead, see these release notes documents:
MySQL 5.6 Release Notes
MySQL Cluster 7.3 Release Notes
MySQL Connector/ODBC Release Notes
MySQL Connector/Net Release Notes (includes MySQL Visual Studio Plugin release notes)
MySQL Connector/J Release Notes
MySQL Connector/C++ Release Notes
MySQL Proxy Release Notes
MySQL for Excel Release Notes
MySQL Installer Release Notes