Quick cardboard roll fixes (CleverRaven#66731)

* quick fix

* docs

data/json/items/containers.json

@@ -4228,7 +4228,15 @@
     "material": [ "cardboard" ],
     "symbol": "o",
     "color": "dark_gray",
-    "pocket_data": [ { "pocket_type": "CONTAINER", "max_contains_volume": "1 L", "max_contains_weight": "2 kg" } ],
+    "pocket_data": [
+      {
+        "pocket_type": "CONTAINER",
+        "max_contains_volume": "1 L",
+        "max_contains_weight": "1 kg",
+        "item_restriction": [ "duct_tape", "medical_tape", "toilet_paper" ],
+        "volume_multiplier": 0.75
+      }
+    ],
     "flags": [ "NO_UNLOAD", "NO_RELOAD" ]
   }
 ]

doc/JSON_INFO.md

@@ -3566,6 +3566,7 @@ Any Item can be a container. To add the ability to contain things to an item, yo
     "max_item_length": "0 mm",        // Maximum length of items that can fit in this pocket, by their longest_side.  Default is the diagonal opening length assuming volume is a cube (cube_root(vol)*square_root(2))
     "spoil_multiplier": 1.0,          // How putting an item in this pocket affects spoilage.  Less than 1.0 and the item will be preserved longer; 0.0 will preserve indefinitely.
     "weight_multiplier": 1.0,         // The items in this pocket magically weigh less inside than outside.  Nothing in vanilla should have a weight_multiplier.
+    "volume_multiplier": 1.0,         // The items in this pocket have less volume inside than outside.  Can be used for containers that'd help in organizing specific contents, such as cardboard rolls for duct tape.
     "moves": 100,                     // Indicates the number of moves it takes to remove an item from this pocket, assuming best conditions.
     "rigid": false,                   // Default false. If true, this pocket's size is fixed, and does not expand when filled.  A glass jar would be rigid, while a plastic bag is not.
     "forbidden": true,                // Default false. If true, this pocket cannot be used by players.