Minor reword

Author: javiereguiluz

configuration.rst

@@ -446,8 +446,8 @@ solutions depending if the application is running in production or in your local
 development machine.
 
 Independent from the way you set environmnet variables, you may need to run the
-``debug:container`` command with the ``--env-vars`` option to verify that the
-env vars are defined and have the expected values:
+``debug:container`` command with the ``--env-vars`` option to verify that they
+are defined and have the expected values:
 
 .. code-block:: terminal