doc function updates and additions (#387)

doc/source/netscript/basicfunctions/formatPercent.rst

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+formatPercent() Netscript Function
+==============================
+
+.. js:function:: formatPercent(number[, fractionalDigits = 2])
+
+    :RAM cost: 0 GB
+
+    :param number number: Number to format.
+    :param number fractionalDigits: Number of digits to show in the fractional part of the decimal number. 
+    
+    :returns: Formatted string.
+
+    Converts a number into a string with percent formatting. 
+
+    The format depends on the Numeric Display settings (all options on the "Numeric Display" options page).
+
+    Examples:
+
+    .. code-block:: javascript
+
+        const number = 1.23456789
+        ns.print(ns.formatPercent(number)); //123.46%
+        ns.print(ns.formatPercent(number,4)); //123.4568%