doc: move gdb doc back to /doc/ and de-emphasize on references page
Fixes #3399.
R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5919044
diff --git a/doc/docs.html b/doc/docs.html
index 709c081..d949628 100644
--- a/doc/docs.html
+++ b/doc/docs.html
@@ -124,6 +124,7 @@
<ul>
<li><a href="/doc/articles/go_command.html">About the Go command</a> - why we wrote it, what it is, what it's not, and how to use it.</li>
<li><a href="/doc/articles/c_go_cgo.html">C? Go? Cgo!</a> - linking against C code with <a href="/cmd/cgo/">cgo</a>.</li>
+<li><a href="/doc/gdb">Debugging Go Code with GDB</a></li>
<li><a href="/doc/articles/godoc_documenting_go_code.html">Godoc: documenting Go code</a> - writing good documentation for <a href="/cmd/godoc/">godoc</a>.</li>
<li><a href="http://blog.golang.org/2011/06/profiling-go-programs.html">Profiling Go Programs</a></li>
</ul>
