Massive doc update

doc/source/netscript/basicfunctions/getPurchasedServerUpgradeCost.rst

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+getPurchasedServerUpgradeCost() Netscript Function
+===========================================
+
+.. js:function:: getPurchasedServerUpgradeCost(hostname, ram)
+
+    :RAM cost: 0.25 GB
+
+    :param string hostname: Hostname of target purchased server.
+    :param number ram: Target amount of RAM for purchased server. Must be a power of 2 (2, 4, 8, 16, etc.). Maximum value of :doc:`getPurchasedServerMaxRam<getPurchasedServerMaxRam>`
+    :returns: Cost to purchase a server with the specified amount of ``ram``.
+
+    Giving any non-power-of-2 as an argument results in the function returning `-1`
+
+    Example:
+
+    .. code-block:: javascript
+        ns.purchaseServer("smallServer",2) //costs 110000
+        ns.getPurchasedServerUpgradeCost("smallServer",8); // returns: 330000