docs: update markdownlint rules for better formatting

tests/apps/scala/README.md

@@ -9,10 +9,10 @@ This application support the [Getting Started with Scala on Heroku](https://devc
 Make sure you have Scala and sbt installed.  Also, install the [Heroku Toolbelt](https://toolbelt.heroku.com/).
 
 ```sh
-$ git clone https://github.com/heroku/scala-getting-started.git
-$ cd scala-getting-started
-$ sbt compile stage
-$ foreman start web
+git clone https://github.com/heroku/scala-getting-started.git
+cd scala-getting-started
+sbt compile stage
+foreman start web
 ```
 
 Your app should now be running on [localhost:5000](http://localhost:5000/).
@@ -20,9 +20,9 @@ Your app should now be running on [localhost:5000](http://localhost:5000/).
 ## Deploying to Heroku
 
 ```sh
-$ heroku create
-$ git push heroku master
-$ heroku open
+heroku create
+git push heroku master
+heroku open
 ```
 
 ## Documentation
@@ -30,4 +30,3 @@ $ heroku open
 For more information about using Scala on Heroku, see these Dev Center articles:
 
 - [Scala on Heroku](https://devcenter.heroku.com/categories/scala)
-