runtime: update documentation for ios addr bits
After this merge: https://go-review.googlesource.com/c/go/+/344401, ios/arm64 was treated as a 64 bit system and the addr bits of ios/arm64 was set to 40
Change-Id: I32d72787d20a3cf952b036e3e887cf5bae2273d8
GitHub-Last-Rev:
8917029fddc4d187b24fad8245fd7eed2bd570ba
GitHub-Pull-Request: golang/go#69343
Reviewed-on: https://go-review.googlesource.com/c/go/+/610856
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Tim King <taking@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>