proper format of limits

Exercise-Configuration.md

@@ -286,21 +286,27 @@ Example:
 
 Mandatory items are bold, optional italic, description of items follows:
 
-* **${box identification}** - ...
-    * _wall-time_ - ...
-    * _memory_ - ...
-    * _parallel_ - ...
+* **${test identification}** - ...
+    * **${pipeline identification}** - ...
+        * **${box identification}** - ...
+            * _wall-time_ - ...
+            * _memory_ - ...
+            * _parallel_ - ...
 
 Example:
 
 ```
-box-id-1:
-  wall-time: 5
-  memory: 50
-  parallel: 500
-box-id-2:
-  wall-time: 6
-  memory: 60
+test-id-1:
+  pipeline-id-1:
+    box-id-1:
+      wall-time: 5
+      memory: 50
+      parallel: 500
+test-id-2:
+  pipeline-id-2:
+    box-id-2:
+      wall-time: 6
+      memory: 60
 ```
 
 ## ExerciseEnvironmentConfig