runtime/debug: replace "GOARM64" with "GOARM" in docs
The former does not exist (yet) but the latter very much exists and is in active use.
Change-Id: Ic8812b98a10f01061a211a0de4caa9e9cfff36fa
GitHub-Last-Rev:
0dab9f524c778b176e4e4b3652f53ea5e2873d26
GitHub-Pull-Request: golang/go#59014
Reviewed-on: https://go-review.googlesource.com/c/go/+/476016
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>