fix definition of echo endpoint

restapi/swagger.yaml

@@ -2071,15 +2071,21 @@ paths:
           description: "Invalid status value"
       security:
       - api_key: []
-  /echo:
+  /echo/{data}:
     get:
       tags:
       - "misc"
-      summary: "Return what was send in the body"
-      description: "Just returns the body content"
+      summary: "Return what was send in the path"
+      description: "Just returns the path"
       operationId: "echoData"
       produces:
       - "application/json"
+      parameters:
+        - name: "data"
+          in: "path"
+          description: "Data to be echoed"
+          required: true
+          type: "string"
       responses:
         "200":
           description: "successful operation"