Add a warning not to set a db password

[sirtet]

and/or how to change the root/drupalpro PW
( in /usr/share/drush/commands/quickstart/quickstart.drush.inc )

[snpdev]

From terminal session:

Step 1: Log into mysql
drupalpro@drupalpro:sudo mysql -p

Step 2: Set new password

MariaDB [(none)]> SET PASSWORD FOR 'root'@localhost = PASSWORD('drupalpro');