reflect: clarify that Value.Comparable checks the value
For #46746
Change-Id: Ic7a31ddf7cd6bf6dd0db6b9eb3fee68fc180f72e
Reviewed-on: https://go-review.googlesource.com/c/go/+/435277 Reviewed-by: Ian Lance Taylor <iant@google.com> Reviewed-by: Bryan Mills <bcmills@google.com>
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