doc/go1.18: change github.com/golang/go/issues to golang.org/issue
doc/go1.18: change github.com/golang/go/issues to golang.org/issue

Updates #47694

Change-Id: I84547ff995e2a302cf229fefefd28a7220a17028
Reviewed-on: https://go-review.googlesource.com/c/go/+/369016
Reviewed-by: Michael Knyszek <4473450dc5c88f06e1fb787f303d7805ec2aee65@google.com>
Trust: Austin Clements <7ea35d812706d9213868749011af1ed4fa2f6aa0@google.com>

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