docs: cleanup markdown warnings (#29511)

docs/docs/quickstart.mdx

@@ -34,6 +34,7 @@ $ cd superset
 # Fire up Superset using Docker Compose
 $ docker compose -f docker-compose-image-tag.yml up
 ```
+
 This may take a moment as Docker Compose will fetch the underlying
 container images and will load up some examples. Once all containers
 are downloaded and the output settles, you're ready to log in.
@@ -41,7 +42,9 @@ are downloaded and the output settles, you're ready to log in.
 ⚠️ If you get an error message like `validating superset\docker-compose-image-tag.yml: services.superset-worker-beat.env_file.0 must be a string`, you need to update your version of `docker-compose`.
 
 ### 3. Log into Superset
+
 Now head over to [http://localhost:8088](http://localhost:8088) and log in with the default created account:
+
 ```bash
 username: admin
 password: admin
@@ -50,10 +53,13 @@ password: admin
 #### 🎉 Congratulations! Superset is now up and running on your machine! 🎉
 
 ### Wrapping Up
+
 Once you're done with Superset, you can stop and delete just like any other container environment:
+
 ```bash
 $ docker compose down
 ```
+
 :::tip
 You can use the same environment more than once, as Superset will persist data locally. However, make sure to properly stop all
 processes by running Docker Compose `stop` command. By doing so, you can avoid data corruption and/or loss of data.
@@ -62,6 +68,7 @@ processes by running Docker Compose `stop` command. By doing so, you can avoid d
 ## What's next?
 
 From this point on, you can head on to:
+
 - [Create your first Dashboard](/docs/using-superset/creating-your-first-dashboard)
 - [Connect to a Database](/docs/configuration/databases)
 - [Using Docker Compose](/docs/installation/docker-compose)