Improve documentation about rdb connect

It would be useful to have more documentation about the connect feature 
https://dev.mysql.com/doc/refman/8.0/en/mysql-config-editor.html
and with postgresql with netrc

```
passwordFilePath = path.Join(core.ExtractUserHomeDir(ctx), core.ExtractEnv(ctx, "APPDATA"), "postgresql", "pgpass.conf")
```
