update BN13 for new UI

doc/source/netscript/stanekapi/fragmentAt.rst

@@ -0,0 +1,28 @@
+fragmentAt() Netscript Function
+=======================================
+
+.. js:function:: fragmentAt(worldX, worldY)
+
+    :RAM cost: 2 GB
+    :param int worldX: World X coordinate of the fragment.
+    :param int worldY: World Y coordinate of the fragment.
+    :returns: The fragment located at `[worldX, worldY]` in Stanek's Gift, or null.
+
+    .. code-block:: typescript
+        {
+            // In world coordinates
+            x: number;
+            y: number;
+            heat: number;
+            charge: number;
+            id: number;
+            shape: boolean[][];
+            type: string;
+            magnitude: number;
+            limit: number;
+        }
+    Example:
+
+    .. code-block:: javascript
+        var fragment = fragmentAt(0, 4);
+        print(fragment); // {'heat': 50, 'charge': 98}