docs(Database): Clarify host value expected when running in docker (a…

…pache#28124)

Co-authored-by: Evan Rusackas <[email protected]>

docs/docs/using-superset/creating-your-first-dashboard.mdx

@@ -44,6 +44,8 @@ or for the purposes of this walkthrough, you can click the link below all these
 
 <img src={useBaseUrl("/img/tutorial/tutorial_03a_database_connection_string_link.png" )} width="600" />{" "} <br/><br/>
 
+Please note, if you are trying to connect to another locally running database (whether on host or another container), and you get the message `The port is closed.`, then you need to adjust the HOST to `host.docker.internal`
+
 Once you've clicked that link you only need to specify two things (the database name and SQLAlchemy URI):