Adjust colon whitespace

Author: bcopy

en/chromebook_setup/instructions.md

@@ -108,7 +108,7 @@ python3 manage.py migrate
 python3 manage.py runserver $PORT
 ```
 
-Once these files are created, go to the Terminal and execute the following commands to create your first Django project :
+Once these files are created, go to the Terminal and execute the following commands to create your first Django project:
 
 {% filename %}Terminal{% endfilename %}
 ```