Fixes typo with reassigning env vars.

Denis Brumann · Denis Brumann · commit 5aabd7482955 · 2019-04-06T15:16:10.000+02:00
Fixes #11304
diff --git a/setup/symfony_server.rst b/setup/symfony_server.rst
@@ -292,7 +292,7 @@ application, so you add the following to the ``.env.local`` file:
 .. code-block:: bash
 
     # .env.local
-    MYSQL_URL=${DATABASE_URL}
+    DATABASE_URL=${MYSQL_URL}
     # ...
 
 Now you can start the containers and all their services will be exposed. Browse
