Update to current version of Go library (revision 94d654be2064).

From-SVN: r171076

libgo/go/html/doc.go

@@ -69,6 +69,9 @@ call to Next. For example, to extract an HTML page's anchor text:
 		}
 	}
 
+A Tokenizer typically skips over HTML comments. To return comment tokens, set
+Tokenizer.ReturnComments to true before looping over calls to Next.
+
 Parsing is done by calling Parse with an io.Reader, which returns the root of
 the parse tree (the document element) as a *Node. It is the caller's
 responsibility to ensure that the Reader provides UTF-8 encoded HTML. For