Another round of documentation.

Bug: N/A
Test: N/A
Change-Id: I1b818fbb36ddd6d084dee56828290c2717a0c9b0
diff --git a/libc/include/net/route.h b/libc/include/net/route.h
index 9c53875..21cd80b 100644
--- a/libc/include/net/route.h
+++ b/libc/include/net/route.h
@@ -26,13 +26,10 @@
  * SUCH DAMAGE.
  */
 
-#ifndef _NET_ROUTE_H_
-#define _NET_ROUTE_H_
+#pragma once
 
 #include <sys/cdefs.h>
 #include <sys/socket.h>
 #include <linux/route.h>
 #include <linux/in6.h>
 #include <linux/ipv6_route.h>
-
-#endif