doc/go1.14: remove TODO about Illumos port
doc/go1.14: remove TODO about Illumos port

There is an active builder that was added in CL 201597,
and it is passing on Go tip and release-branch.go1.13
(with one failure that appears to be flaky due to being
out of memory). It's also passing on all golang.org/x repos
on tip and release-branch.go1.13. It's not configured to
run on Go 1.12 release branches.

Updates #36878
Updates #15581

Change-Id: I4ed7fc62c11a09743832fca39bd61fa0cf6e7ded
Reviewed-on: https://go-review.googlesource.com/c/go/+/217737
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
Reviewed-by: Alexander Rakoczy <60c6d277a8bd81de7fdde19201bf9c58a3df08f4@golang.org>

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