lib/godoc: convert indentation to tabs.

R=golang-dev, dsymonds, rsc
CC=golang-dev
https://golang.org/cl/7497048

lib/godoc/package.html

@@ -252,7 +252,7 @@ $(document).ready(function() {
 			var resize = function() {
 				code.height(0);
 				var h = code[0].scrollHeight;
-				code.height(h+20); // minimize bouncing
+				code.height(h+20); // minimize bouncing.
 				code.closest('.input').height(h);
 			};
 			code.on('keydown', resize);