runtime: make Frames example produce documented output
I believe now this code can work in both test and standalone situations.
Fixes #70057
Change-Id: Ieb5163e6b917fd03d050f65589df6c31ad2515fe
GitHub-Last-Rev:
db4863c05e4d4bcbd40caf459d29e2eee81f847b
GitHub-Pull-Request: golang/go#70270
Reviewed-on: https://go-review.googlesource.com/c/go/+/625904
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Bypass: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>