Improve readability

Co-authored-by: Raphael Das Gupta <github.com@raphael.dasgupta.ch>

Author: bcopy

en/django_start_project/README.md

@@ -145,7 +145,8 @@ ALLOWED_HOSTS = ['127.0.0.1', '.pythonanywhere.com']
 >     ```python
 >     ALLOWED_HOSTS = [os.getenv('PROJECT_DOMAIN') + ".glitch.me"]
 >     ```
->     The PROJECT_DOMAIN value is automatically generated by Glitch, it will correspond to the name of your project.
+>     The `PROJECT_DOMAIN` value is automatically generated by Glitch.
+>     It will correspond to the name of your project.
 
 ## Set up a database