doc/go1.3.html: document the state of FreeBSD

Update #7056

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/88070045

doc/go1.3.html

@@ -53,6 +53,18 @@ as of Go 1.3 it is not supported by Go either.
 </p>
 
 
+<h3 id="solaris">Support for FreeBSD</h3>
+
+<p>
+It was not announced at the time, but since the release of Go 1.2, support for Go on FreeBSD
+requires FreeBSD 8 or above.
+</p>
+
+<p>
+As of Go 1.3, support for Go on FreeBSD requires that the kernel be compiled with the
+<code>COMPAT_FREEBSD32</code> flag configured.
+</p>
+
 <h2 id="memory">Changes to the memory model</h2>
 
 <p>
@@ -370,8 +382,6 @@ now closes <a href="/pkg/net/http/#Request"><code>Request.Body</code></a>
 consistently, even on error.
 </li>
 
-<li> TODO: net: enable fast socket creation using SOCK_CLOEXEC and Accept4 on FreeBSD 10 (69100043)</li>
-
 <li>
 The <a href="/pkg/os/exec/"><code>os/exec</code></a> package now implements
 what the documentation has always said with regard to relative paths for the binary.
@@ -395,8 +405,6 @@ now considers the <code>DEL</code> character, <code>U+007F</code>, to be
 non-printing.
 </li>
 
-<li> TODO: syscall: add Accept4 for freebsd (CL 68880043)</li>
-
 <li>
 On Windows, the <a href="/pkg/syscall/"><code>syscall</code></a> package now
 supports the cdecl calling convention through the addition of a new function
@@ -405,8 +413,6 @@ alongside the existing function
 <a href="/pkg/syscall/#NewCallback"><code>NewCallback</code></a>.
 </li>
 
-<li> TODO: syscall: add support for FreeBSD 10 (CL 56770044, 56980043)</li>
-
 <li>
 The <a href="/pkg/testing/"><code>testing</code></a> package now
 diagnoses tests that call <code>panic(nil)</code>, which are almost always erroneous.