update BN13 for new UI

doc/source/netscript/stanekapi/charge.rst

@@ -0,0 +1,21 @@
+charge() Netscript Function
+=======================================
+
+.. js:function:: charge(worldX, worldY)
+
+    :RAM cost: 0.4 GB
+    :param int worldX: World X of the fragment to charge.
+    :param int worldY: World Y of the fragment to charge.
+
+    Charge a fragment, increasing it's power but also it's heat. The
+    effectiveness of the charge depends on the amount of ram the running script
+    consumes as well as the fragments current heat. This operation takes time to
+    complete.
+
+    Example:
+
+    .. code-block:: javascript
+        charge(0, 4); // Finishes 5 seconds later.
+.. warning::
+
+    Netscript JS users: This function is `async`