os: fix broken comment's link

Change-Id: Icf6cb06dfdde00de1db5e57b243d7e60a9e4e7ac
GitHub-Last-Rev: 45003b0656dec68cf0bc1f32b3de2ab688875524
GitHub-Pull-Request: golang/go#35834
Reviewed-on: https://go-review.googlesource.com/c/go/+/208837
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/src/os/file.go b/src/os/file.go
index 51e0993..7995de7 100644
--- a/src/os/file.go
+++ b/src/os/file.go
@@ -411,7 +411,7 @@
 // subdirectory within this one and use that.
 //
 // On Unix systems, it returns $XDG_CONFIG_HOME as specified by
-// https://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html if
+// https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html if
 // non-empty, else $HOME/.config.
 // On Darwin, it returns $HOME/Library/Application Support.
 // On Windows, it returns %AppData%.