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

The solaris-amd64-oraclerel builder is passing for the main Go repo
(on tip and release branches for 1.13 and 1.12), and golang.org/x repos
(also on tip and release branches for 1.13 and 1.12).

The builder is still maintained as described at
https://golang.org/issue/15581#issuecomment-550368581.

Updates #36878
Updates #15581

Change-Id: Icc6f7529ca2e05bb34f09ce4363d9582e80829c6
Reviewed-on: https://go-review.googlesource.com/c/go/+/217738
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
Reviewed-by: Alexander Rakoczy <60c6d277a8bd81de7fdde19201bf9c58a3df08f4@golang.org>

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