correct pipelines json

Exercise-Configuration.md

@@ -203,6 +203,8 @@ tests:
 
 ## Pipeline
 
+Pipelines are sent to clients in JSON format and are stored in API in corresponding YAML with the same structure.
+
 Mandatory items are bold, optional italic, description of items follows:
 
 * **${implicit list of boxes}** - ...
@@ -218,37 +220,37 @@ Example:
    {
       "name":"source",
       "portsIn":[],
-      "portsOut":[ "source_file" => "source_file" ],
+      "portsOut":[{ "source_file":"source_file" }],
       "type":"data"
    },
    {
       "name":"test",
       "portsIn":[],
-      "portsOut":[
-         "test_file" => "test_file",
-         "expected_output" => "expected_output"
-      ],
+      "portsOut":[{
+         "test_file":"test_file",
+         "expected_output":"expected_output"
+      }],
       "type":"data"
    },
    {
       "name":"compilation",
-      "portsIn":[ "input_file" => "source_file" ],
-      "portsOut":[ "output_file" => "binary_file" ],
+      "portsIn":[{ "input_file":"source_file" }],
+      "portsOut":[{ "output_file":"binary_file" }],
       "type":"compilation"
    },
    {
       "name":"run",
-      "portsIn":[ "binary_file" => "binary_file" ],
-      "portsOut":[ "output_file" => "actual_output" ],
+      "portsIn":[{ "binary_file":"binary_file" }],
+      "portsOut":[{ "output_file":"actual_output" }],
       "type":"execution"
    },
    {
       "name":"judge",
-      "portsIn":[
-         "actual_output" => "actual_output",
-         "expected_output" => "expected_output"
-      ],
-      "portsOut":[ "score" => "score" ],
+      "portsIn":[{
+         "actual_output":"actual_output",
+         "expected_output":"expected_output"
+      }],
+      "portsOut":[{ "score":"score" }],
       "type":"evaluation"
    }
 ]