Make Item resource return tuple w/ quueue JSON and HTTP return code p…

…lus update docs

api/api.py

@@ -52,6 +52,7 @@ def post(self) -> tuple:
                 200 (OK): On success.
                 401 (Unauthroized): When username or password are incorrect.
                 422 (Unprocessable Entitiy): When the username or password can't be parsed.
+                500 (Internal Server Error): On API error.
 
         Example:
                 curl -X POST
@@ -100,9 +101,13 @@ def post(self):
 
 class Item(Resource):
     @jwt_required
-    def get(self, queue: str, number: int) -> str:
+    def get(self, queue: str, number: int) -> tuple:
         """Returns the JSON representation of the item requested.
 
+        Return Codes:
+                200 (OK): On success.
+                500 (Internal Server Error): On API error.
+
         Example:
             /api/ce/100 returns:
             {
@@ -127,9 +132,9 @@ def get(self, queue: str, number: int) -> str:
             item (int): The number of the item requested.
 
         Returns:
-            str: JSON representation of the item requested.
+            tuple: Response containing queue as JSON and HTTP response code.
         """
-        return ECNQueue.Item(queue, number).toJson()
+        return (ECNQueue.Item(queue, number).toJson(), 200)
 
 class Queue(Resource):
     @jwt_required