internal/export/idna: remove spurious comment

Change-Id: I44e8cc6d57c1abd9f76645e4548d9bcef8422fb2
Reviewed-on: https://go-review.googlesource.com/34648
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
1 file changed