Add note to ommit periods in database name.
Add note to ommit periods in database name.

https://github.com/cakephp/cakephp/issues/6471
QoboLtd/project-template-cakephp,QoboLtd/project-template-cakephp,QoboLtd/project-template-cakephp,makallio85/fish-diary,QoboLtd/project-template-cakephp,makallio85/fish-diary,QoboLtd/project-template-cakephp,makallio85/fish-diary