GitLab

Rename should document that it returns *LinkError,
like Create and Stat do.

Fixes #10061

Change-Id: I7bfe8b0267f6c4a57dd6b26cba44928714711724
Reviewed-on: https://go-review.googlesource.com/12353

Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>