fix php container name

Author: nayluge

deployment/docker.md

@@ -7,7 +7,7 @@ stack is shipped with the API Platform distribution.
 To install it, run the following commands (Docker must be installed on your system):
 
     $ docker-compose up -d # Download, build and run Docker images
-    $ docker-compose exec web bin/console doctrine:schema:create # Create the MySQL schema
+    $ docker-compose exec php bin/console doctrine:schema:create # Create the MySQL schema
 
 Your project will be accessible at the URL `http://127.0.0.1`.