Update recommended maximum database instances (#30452)

Author: sethsamuel

layouts/shortcodes/dbm-mysql-agent-config-examples.en.md

@@ -1,6 +1,6 @@
 ### One agent connecting to multiple hosts
 It is common to configure a single Agent host to connect to multiple remote database instances (see [Agent installation architectures](/database_monitoring/architecture/) for DBM). To connect to multiple hosts, create an entry for each host in the MySQL integration config.
-In these cases, Datadog recommends limiting the number of instances per Agent to a maximum of 10 database instances to guarantee reliable performance.
+An agent with 4 CPUs and 16GB of RAM can monitor up to 30 databases with the same resources each.
 
 ```yaml
 init_config:

layouts/shortcodes/dbm-postgres-agent-config-examples.en.md

@@ -1,6 +1,6 @@
 ### One agent connecting to multiple hosts
 It is common to configure a single Agent host to connect to multiple remote database instances (see [Agent installation architectures](/database_monitoring/architecture/) for DBM). To connect to multiple hosts, create an entry for each host in the Postgres integration config.
-In these cases, Datadog recommends limiting the number of instances per Agent to a maximum of 10 database instances to guarantee reliable performance.
+An agent with 4 CPUs and 16GB of RAM can monitor up to 30 databases with the same resources each.
 ```yaml
 init_config:
 instances:

layouts/shortcodes/dbm-sqlserver-agent-config-examples.en.md

@@ -121,7 +121,7 @@ instances:
 
 ### One Agent connecting to multiple hosts
 It is common to configure a single Agent host to connect to multiple remote database instances (see [Agent installation architectures][1006] for DBM). To connect to multiple hosts, create an entry for each host in the SQL Server integration config.
-In these cases, Datadog recommends limiting the number of instances per Agent to a maximum of 10 database instances to guarantee reliable performance.
+An agent with 4 CPUs and 16GB of RAM can monitor up to 30 databases with the same resources each.
 ```yaml
 init_config:
 instances:
@@ -218,4 +218,4 @@ instances:
 ```
 
 [1005]: https://github.com/DataDog/integrations-core/blob/master/sqlserver/datadog_checks/sqlserver/data/conf.yaml.example
-[1006]: /database_monitoring/architecture/
+[1006]: /database_monitoring/architecture/