doc: fix template link in readme

Change-Id: Ic9df686244c5e87cf53c82eb231ad7a1f1156a7c
Reviewed-on: https://go-review.googlesource.com/19538
Reviewed-by: Andrew Gerrand <adg@golang.org>

README.md

@@ -51,7 +51,7 @@ starting point for your own code.
 
 _Note_: The `goapp` tool is part of the [Google App Engine SDK for Go](https://cloud.google.com/appengine/downloads#Google_App_Engine_SDK_for_Go).
 
-### [template][template/] ([godoc](//godoc.org/github.com/golang/example/template))
+### [template](template/) ([godoc](//godoc.org/github.com/golang/example/template))
 
 A trivial web server that demonstrates the use of the
 [`template` package](https://golang.org/pkg/text/template/)'s `block` feature.