[ci skip]: Add doc for MQ Advanced for Developers on arm64 (#528) (#495)

Co-authored-by: Arthur Barr <arthurbarr@users.noreply.github.com>

Author: 2 people

docs/building.md

@@ -45,7 +45,7 @@ MQ_ARCHIVE=mq-1.2.3.4.tar.gz MQ_VERSION=1.2.3.4 make build-advancedserver
 
 ## Building a developer image
 
-Run `make build-devserver`, which will download the latest version of MQ Advanced for Developers from IBM developerWorks.  This is currently only available on the `amd64` architecture.
+Run `make build-devserver`, which will download the latest version of MQ Advanced for Developers.  This is available on the `amd64` and `arm64` (Apple Silicon) architectures.
 
 You can use the environment variable `MQ_ARCHIVE_DEV` to specify an alternative local file to install from (which must be in the `downloads` directory).