spec: clarify that comparable cannot be a union element
For #49602. Change-Id: I0d3ff8f087dffb3409918494147fd1dceff7514d Reviewed-on: https://go-review.googlesource.com/c/go/+/372694 Trust: Robert Griesemer <gri@golang.org> Run-TryBot: Robert Griesemer <gri@golang.org> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by:Ian Lance Taylor <iant@golang.org>
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