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Update MGTK.md

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@ -10,7 +10,13 @@ This is a complex API library written by Apple circa 1985. It consists of:
* [Commands](#commands-1)
* [More](#more)
For the purposes of DeskTop, the entry point is fixed at $4000 AUX, called MLI-style (JSR followed by command type and address of param block).
For the purposes of DeskTop, the entry point is fixed at $4000 AUX, called MLI-style:
```
JSR $4000
.byte call
.addr params
```
Result will be in A, with Z bit set, 0 indicating success (so `BNE error` works).
ca65 syntax is used for primitives: `.byte`, `.word` (interpreted as 16-bit signed integer), `.addr` (16-bit address), `.res N` (N byte buffer)