go.tools/godoc/static: indent with tabs.

LGTM=gri
R=golang-codereviews, gobot, gri
CC=golang-codereviews
https://golang.org/cl/120390043
diff --git a/godoc/static/methodset.html b/godoc/static/methodset.html
index 2a09c68..1b339e3 100644
--- a/godoc/static/methodset.html
+++ b/godoc/static/methodset.html
@@ -4,6 +4,6 @@
 	</div>
 	<div class="expanded">
 		<p class="exampleHeading toggleButton">▾ <span class="text">Method set</span></p>
-                <div style="margin-left: 1in" id='methodset-{{.Index}}'>...</div>
+		<div style="margin-left: 1in" id='methodset-{{.Index}}'>...</div>
 	</div>
 </div>