• Update the glossary & add Amazon RDS related terminology
• Update the deployment instructions

Tasks

1. https://www.percona.com/doc/percona-monitoring-and-management/amazon-rds.html#monitoring-amazon-rds-os-metrics - needs to be updated to add a section explaining _PMM Add Instance
2. https://www.percona.com/doc/percona-monitoring-and-management/amazon-rds.html#monitoring-amazon-rds-os-metrics mention that there are two ways to monitor RDS - using mysqld_exporter 9which is the existing content) vs using _PMM Add Instance - the GUI way should be listed first as it is preferred
3. https://www.percona.com/doc/percona-monitoring-and-management/amazon-rds.html#monitoring-amazon-rds-os-metrics remove mention of hte cloudwatch dashboard as it has been removed
4. Add an introduction section that discusses the generic RDS/Aurora configuration requirements