[release-branch.go1.8] doc: remove inactive members of the CoC working group

Dave and Jason have moved on to other things.

Change-Id: I702d11bedfab1f47a33679a48c2309f49021229e
Reviewed-on: https://go-review.googlesource.com/36450Reviewed-by: Dave Cheney <dave@cheney.net>
Reviewed-on: https://go-review.googlesource.com/36474Reviewed-by: Andrew Gerrand <adg@golang.org>

doc/conduct.html

@@ -185,8 +185,6 @@ satisfaction of all parties. They are:
 <ul>
 	<li>Aditya Mukerjee &lt;dev@chimeracoder.net&gt;
 	<li>Andrew Gerrand &lt;adg@golang.org&gt;
-	<li>Dave Cheney &lt;dave@cheney.net&gt;
-	<li>Jason Buberel &lt;jbuberel@google.com&gt;
 	<li>Peggy Li &lt;peggyli.224@gmail.com&gt;
 	<li>Sarah Adams &lt;sadams.codes@gmail.com&gt;
 	<li>Steve Francia &lt;steve.francia@gmail.com&gt;