doc: GCC 6 will have the Go 1.6 user libraries

Fixes #14759.

Change-Id: I6cef0b49ba00ab85b25ce1e7bad80ad85e2d5076
Reviewed-on: https://go-review.googlesource.com/20545
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>
Reviewed-on: https://go-review.googlesource.com/22048Reviewed-by: Ian Lance Taylor <iant@golang.org>

doc/go1.6.html

@@ -168,9 +168,7 @@ Go 1.7 will remove support for the old syntax.
 <p>
 The release schedules for the GCC and Go projects do not coincide.
 GCC release 5 contains the Go 1.4 version of gccgo.
-The next release, GCC 6, will have the Go 1.5 version of gccgo.
-Due to release scheduling, it is likely that
-Go 1.6 will not be in a GCC release until GCC 7.
+The next release, GCC 6, will have the Go 1.6 version of gccgo.
 </p>
 
 <h3 id="go_command">Go command</h3>