runtime/trace: comment newlines to restore correct doc summary
runtime/trace: comment newlines to restore correct doc summary

Fixes #26309

Change-Id: I0e0b61b885817e514aa46e299b00833f16e98b2a
Reviewed-on: https://go-review.googlesource.com/122898
Reviewed-by: Айнар Гарипов <8000b44fa86eaec0eedca699a849fef3186f9f49@gmail.com>
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

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