godoc: specify HTML page metadata with a JSON blob
This allows HTML pages to specify arbitrary data in a header:
<!--{
"Title": "The page title",
...
}-->
replacing the old style comments:
<!-- title The page title -->
R=gri, rsc, r, bradfitz, dsymonds
CC=golang-dev
https://golang.org/cl/5532093
diff --git a/doc/contrib.html b/doc/contrib.html
index 5e00345..3ef7d56 100644
--- a/doc/contrib.html
+++ b/doc/contrib.html
@@ -1,4 +1,6 @@
-<!-- title Contributing -->
+<!--{
+ "Title": "Contributing"
+}-->
<div class="left-column">
