docs: a better mention of Devstack

Author: Ned Batchelder

README.rst

@@ -10,7 +10,7 @@ recommend that you use a service provider to run the software for you.  They
 have free trials that make it easy to get started:
 https://openedx.org/get-started/
 
-If you will be modifying edx-platform code, the `Open edX Developer Stack`_ (Developer Stack) is
+If you will be modifying edx-platform code, the `Open edX Developer Stack`_ (Devstack) is
 a Docker-based development environment.
 
 If you want to run your own Open edX server and have the technical skills to do