os: use same link in UserCacheDir/UserConfigDir doc
os: use same link in UserCacheDir/UserConfigDir doc

Change-Id: I94c385243c37589f56aadaa30336b400adf31308
Reviewed-on: https://go-review.googlesource.com/c/go/+/234959
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

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