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To clarify that it is for single Signed Exchange.

Bug: 803774
Change-Id: I9a7acc5b3c7b1074828c0560fba819ae351d6ff7
Reviewed-on: https://chromium-review.googlesource.com/1100658Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567535}