Add another environment variable for demo

Closes: #3815

docs/tasks/inject-data-application/define-environment-variable-container.md

@@ -60,6 +60,7 @@ Pod:
         HOSTNAME=envar-demo
         ...
         DEMO_GREETING=Hello from the environment
+        DEMO_FAREWELL=Such a sweet sorrow
 
 1. To exit the shell, enter `exit`.
 

docs/tasks/inject-data-application/envars.yaml

@@ -11,3 +11,5 @@ spec:
     env:
     - name: DEMO_GREETING
       value: "Hello from the environment"
+    - name: DEMO_FAREWELL
+      value: "Such a sweet sorrow"