net: add import comments.

Change-Id: Ifab0fdaec1d810d268b7c19ad30f476802203b37
diff --git a/webdav/webdav.go b/webdav/webdav.go
index 389512b..8a8f6dc 100644
--- a/webdav/webdav.go
+++ b/webdav/webdav.go
@@ -3,7 +3,7 @@
 // license that can be found in the LICENSE file.
 
 // Package webdav etc etc TODO.
-package webdav
+package webdav // import "golang.org/x/net/webdav"
 
 // TODO: ETag, properties.