update lms readme

lms/envs/README.txt

-Transitional for moving to new settings scheme. 
+Transitional for moving to new settings scheme.
 
-To use: 
-  django-admin.py runserver --settings=envs.dev --pythonpath=.
+To use:
+   rake lms
+   or
+   django-admin.py runserver --settings=lms.envs.dev --pythonpath=.
 
 NOTE: Using manage.py will automatically run mitx/settings.py first, regardless
 of what you send it for an explicit --settings flag. It still works, but might
-have odd side effects. Using django-admin.py avoids that problem. 
+have odd side effects. Using django-admin.py avoids that problem.
 django-admin.py is installed by default when you install Django.
 
 To use with gunicorn_django in debug mode:
 
-  gunicorn_django envs/dev.py
+  gunicorn_django lms/envs/dev.py