[foreign-jextract] RFR: Update memory access and linker documents

[Jorn Vernee]

On Thu, 25 Mar 2021 14:48:10 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> doc/panama_ffi.md line 135:
>> 
>>> 133:     MemorySegment upcallStub(MethodHandle target, FunctionDescriptor function, ResourceScope scope);
>>> 134:     MemorySegment upcallStub(MethodHandle target, FunctionDescriptor function);
>>> 135:     ...
>> 
>> We also now have the downcallHandle overload that takes a SegmentAllocator
>
> yeah - since the examples never mention it, I didn't want to dive too much into that. I think I will simplify this further and just keep two methods (but then say that there are other overloads available).

Ok, sounds good

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PR: https://git.openjdk.java.net/panama-foreign/pull/475