Documentation contains deprecated code

Hi,
Starting to look at my code in order to optimize and clean up deprecated code. As part of the process I was looking for good examples of clean code.
In the documentation the code example for working with multiple databases:
https://documentation.concretecms.org/developers/working-with-blocks/creating-a-new-block-type/multiple-database-tables
still uses deprecated code.
Can anyone suggest a good example of a controller using multiple database that I might use as an example of best practices?
Thank you

The config in the existing docs is correct. To connect:
https://documentation.concretecms.org/developers/framework/database-management/connecting-multiple-databases
https://documentation.concretecms.org/developers/appendix/deprecated-code-reference-ongoing

$db = $app->make('database')->connection(); 
$db_connection_handle = $app->make('database')->connection('connection_handle');

The documentation link is in the documentation under creating a new block. Thanks for pointing me to the other reference in the framework section of the documentation. The specific mistake in the first page is using:

$db = Loader::db(); instead of $db = Database::connection();

@dgreer feel free to click on the Edit link at the top of the page with the problem and submit a proposed correction. Thanks in advance!