time: fix comment in test
time: fix comment in test

The commit de36d1 (CL 4635083) changed the test time
from 2009 to 2010 but forgot to update the comment.

Change-Id: Ia2928773dd184f168fddde126d0bb936de8cfc29
GitHub-Last-Rev: bf8eb57140dc531d1af449308b79c646d3b64d02
GitHub-Pull-Request: golang/go#35930
Reviewed-on: https://go-review.googlesource.com/c/go/+/209517
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

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