contrib*.html: make "golang-dev" the default reviewer.

also make a couple of links more visible and fix an id= href.

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/4517063

doc/contrib.html

@@ -4,7 +4,7 @@
 
 <h2 id="howto">How you can help</h2>
 
-<h3>Reporting issues</h3>
+<h3><a href="http://code.google.com/p/go/issues">Reporting issues</a></h3>
 
 <p>
 If you spot bugs, mistakes, or inconsistencies in the Go project's code or
@@ -19,7 +19,7 @@ a new one.)
 We pride ourselves on being meticulous; no issue is too small.
 </p>
 
-<h3>Contributing code</h3>
+<h3><a href="contribute.html">Contributing code</a></h3>
 
 <p>
 Go is an open source project and we welcome contributions from the community.
@@ -39,7 +39,7 @@ are particularly in need of outside help.
 
 <div class="right-column">
 
-<h2 id="">The Go Project</h2>
+<h2 id="the_go_project">The Go Project</h2>
 
 <h3 id="build_status"><a href="http://godashboard.appspot.com/">Build Status</a></h3>
 <p>View the status of Go builds across the supported operating

doc/contribute.html

@@ -209,7 +209,8 @@ The <code>Reviewer</code> line lists the reviewers assigned
 to this change, and the <code>CC</code> line lists people to
 notify about the change.
 These can be code review nicknames or arbitrary email addresses.
-If you don't know who is best to review the change, set the
+Unless explicitly told otherwise, such as in the discussion leading
+up to sending in the change list, set the
 reviewer field to the
 <a href="http://groups.google.com/group/golang-dev">golang-dev@googlegroups.com</a>
 mailing list.