doc: drop scheme from links that are known to support HTTPS
golang.org now serves HTTPS with a valid cert, so it's reasonable
that users should click through to the HTTPS versions of *.golang.org
and other known sites.
LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/112650043
diff --git a/doc/go_spec.html b/doc/go_spec.html
index 8832375..0200762 100644
--- a/doc/go_spec.html
+++ b/doc/go_spec.html
@@ -23,7 +23,7 @@
<p>
This is a reference manual for the Go programming language. For
-more information and other documents, see <a href="/">http://golang.org</a>.
+more information and other documents, see <a href="/">golang.org</a>.
</p>
<p>
