html/template: fix broken links
Fixes #7562.

LGTM=nigeltao
R=nigeltao
CC=golang-codereviews
https://golang.org/cl/81190044
diff --git a/src/pkg/html/template/html.go b/src/pkg/html/template/html.go
index f25f107..9c069ef 100644
--- a/src/pkg/html/template/html.go
+++ b/src/pkg/html/template/html.go
@@ -50,12 +50,12 @@
 // htmlReplacementTable contains the runes that need to be escaped
 // inside a quoted attribute value or in a text node.
 var htmlReplacementTable = []string{
-	// http://www.w3.org/TR/html5/tokenization.html#attribute-value-unquoted-state: "
+	// http://www.w3.org/TR/html5/syntax.html#attribute-value-(unquoted)-state
 	// U+0000 NULL Parse error. Append a U+FFFD REPLACEMENT
 	// CHARACTER character to the current attribute's value.
 	// "
 	// and similarly
-	// http://www.w3.org/TR/html5/tokenization.html#before-attribute-value-state
+	// http://www.w3.org/TR/html5/syntax.html#before-attribute-value-state
 	0:    "\uFFFD",
 	'"':  """,
 	'&':  "&",