doc: note net/UnixListener.SetUnlinkOnClose in go1.8.html

TBR=See https://golang.org/cl/33244

Updates #17929

Change-Id: I201ffe489842ff17277424be4a012558d161f0a7
Reviewed-on: https://go-review.googlesource.com/33672Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

doc/go1.8.html

@@ -967,6 +967,13 @@ pkg debug/pe, type StringTable []uint8</pre>
       they implement the documented semantics. TODO: https://golang.org/cl/18097
     </p>
 
+    <p><!-- CL 32099 -->
+      The new method
+      <a href="/pkg/net/#UnixListener.SetUnlinkOnClose"><code>UnixListener.SetUnlinkOnClose</code></a>
+      sets whether the underlying socket file should be removed from the file system when
+      the listener is closed.
+    </p>
+
     <p>TODO: many other net changes</p>
 
   </dd>

doc/go1.8.txt

@@ -116,7 +116,6 @@ net/http/httputil: make ReverseProxy send nil Body requests when possible (CL 28
 net/http/httputil: remove custom hop-by-hop headers from response in ReverseProxy (CL 28810)
 net/http/httputil: remove proxied headers mentioned in connection-tokens (CL 27970)
 
-net: add (*UnixListener).SetUnlinkOnClose (CL 32099)
 net: add Buffers type, do writev on unix (CL 29951)
    net: implement Buffers on windows (CL 32371)
 net: add Resolver type, Dialer.Resolver, and DefaultResolver (CL 29440)
@@ -452,6 +451,7 @@ net/url: handle escaped paths in ResolveReference (CL 28343)
 net/url: make URL implement encoding.BinaryMarshaler, BinaryUnmarshaler (CL 31467)
 net/url: prefix relative paths containing ":" in the first segment with "./" (CL 29610)
 net/url: reject colon in first segment of relative path in Parse (CL 31582)
+net: add (*UnixListener).SetUnlinkOnClose (CL 32099)
 net: always wake up the readers on close on Plan 9 (CL 31390)
 net: close the connection gracefully on Plan 9 (CL 31271)
 net: implement network interface API for Plan 9 (CL 29963)