PR: https://github.com/mramendi/kie-docs/pull/100

Rendered:

http://file.ork.redhat.com/~mramendi/BXMSDOC-6013-au/#externaldb-build-proc updated build procedure

http://file.ork.redhat.com/~mramendi/BXMSDOC-6013-au/#template-deploy-externaldb-authoring-proc external DB settings for templates - updated dialects and added the need to set MySQL 8 authentication 

http://file.ork.redhat.com/~mramendi/BXMSDOC-6013-au/#environment-authoring-single-modify-proc modified the Important note at the end - it now says that you must build an extension image if using a DB server other than Mysql, Mariadb, Postgresql (maria was not listed before, but FIlippe told me the Maria driver is used by default now)

http://file.ork.redhat.com/~mramendi/BXMSDOC-6013-op/#operator-deploy-kieserver-proc added MariaDB in Step 16, updated dialects n Step 17, added Step 18 for MySQL 8 authentication.