runtime: fix typo in comment
runtime: fix typo in comment

Change-Id: I96db053184e5e72864514d5421a97774545cc2dd
GitHub-Last-Rev: f1451ab626563f82f1703a559e4cb6d66665a7b6
GitHub-Pull-Request: golang/go#36425
Reviewed-on: https://go-review.googlesource.com/c/go/+/213597
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

nawawi/go,golang/go,cloudflare/go,nawawi/go,nawawi/go,nawawi/go,golang/go,cloudflare/go,cloudflare/go,cloudflare/go,nawawi/go,golang/go,golang/go,nawawi/go,akutz/go,CAFxX/go,akutz/go,golang/go,cloudflare/go,akutz/go,akutz/go,cloudflare/go,CAFxX/go,CAFxX/go,nawawi/go,akutz/go,akutz/go,golang/go,CAFxX/go,golang/go,nawawi/go,golang/go,CAFxX/go,cloudflare/go,CAFxX/go,CAFxX/go,akutz/go,CAFxX/go,akutz/go,cloudflare/go