doc/go1.18: add docs for SysProcAttr.Pdeathsig

CL 355570

Updates #47694

Change-Id: I922cda28ca4cf1ae6d5e4f457cc66d5041b0e3e8
Reviewed-on: https://go-review.googlesource.com/c/go/+/368798
Trust: Jeremy Faller <jeremy@golang.org>
Run-TryBot: Jeremy Faller <jeremy@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
diff --git a/doc/go1.18.html b/doc/go1.18.html
index 4f48514..fa65ad6 100644
--- a/doc/go1.18.html
+++ b/doc/go1.18.html
@@ -761,7 +761,8 @@
     </p>
 
     <p><!-- CL 355570 -->
-      TODO: <a href="https://golang.org/cl/355570">https://golang.org/cl/355570</a>: add support for SysProcAttr.Pdeathsig on FreeBSD
+      <a href="/pkg/syscall/?GOOS=freebsd#SysProcAttr.Pdeathsig"><code>SysProcAttr.Pdeathsig</code></a>.
+      is now supported in FreeBSD.
     </p>
   </dd>
 </dl><!-- syscall -->