language: improved example for parsing regions

Clarify that ccTLDs are handled even if not equivalent to ISO3166.

Change-Id: If77bfb1d4a0f2bee11f3b76f3c93c1120c8b285a
Reviewed-on: https://go-review.googlesource.com/16471
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
1 file changed