doc/go1.9: pprof profiles are now self-contained

Change-Id: If9f64fbb78009921e8773124e4e5eb8a871095a5
Reviewed-on: https://go-review.googlesource.com/48192Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>

doc/go1.9.html

@@ -227,7 +227,14 @@ type T1 = T2
 </p>
 
 
-<h3 id="go-tool-pprof-proxy">Pprof</h3>
+<h3 id="go-tool-pprof">Pprof</h3>
+
+<p> <!-- CL 34192 -->
+  Profiles produced by the <code>runtime/pprof</code> package now
+  include symbol information, so they can be viewed
+  in <code>go</code> <code>tool</code> <code>pprof</code>
+  without binary that produced the profile.
+</p>
 
 <p> <!-- CL 38343 -->
   The <code>go</code> <code>tool</code> <code>pprof</code> command now