NETSCRIPT: add formulas.hacking.growAmount() (#1090)

Also, improve docs.

markdown/bitburner.hackingformulas.growamount.md

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+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [bitburner](./bitburner.md) &gt; [HackingFormulas](./bitburner.hackingformulas.md) &gt; [growAmount](./bitburner.hackingformulas.growamount.md)
+
+## HackingFormulas.growAmount() method
+
+Calculate the amount of money a grow action will leave a server with. Starting money is server.moneyAvailable. Note that when simulating the effect of [grow](./bitburner.ns.grow.md)<!-- -->, what matters is the state of the server and player when the grow \*finishes\*, not when it is started.
+
+The growth amount depends both linearly \*and\* exponentially on threads; see [grow](./bitburner.ns.grow.md) for more details.
+
+The inverse of this function is [formulas.hacking.growThreads](./bitburner.hackingformulas.growthreads.md)<!-- -->, although it rounds up to integer threads.
+
+**Signature:**
+
+```typescript
+growAmount(server: Server, player: Person, threads: number, cores?: number): number;
+```
+
+## Parameters
+
+|  Parameter | Type | Description |
+|  --- | --- | --- |
+|  server | [Server](./bitburner.server.md) | Server info, typically from [getServer](./bitburner.ns.getserver.md) |
+|  player | [Person](./bitburner.person.md) | Player info, typically from [getPlayer](./bitburner.ns.getplayer.md) |
+|  threads | number | Number of threads to grow with. Can be fractional. |
+|  cores | number | _(Optional)_ Number of cores on the computer that will execute grow. |
+
+**Returns:**
+
+number
+
+The amount of money after the calculated grow.
+