RFR (14) 8237370: Javadoc of memory access API still refers to old MemoryAddress::offset method

[Chris Hegarty]

> On 16 Jan 2020, at 15:40, Maurizio Cimadamore <maurizio.cimadamore at oracle.com> wrote:
> 
> Small patch which fixes some @code snippets still showing MemoryAddress::offset(long) instead of MemoryAddress::addOffset(long)
> 
> Webrev:
> 
> http://cr.openjdk.java.net/~mcimadamore/8237370/

LGTM.

-Chris.