all: fix typos and spelling

Change-Id: Icd06d99c42b8299fd931c7da821e1f418684d913
Reviewed-on: https://go-review.googlesource.com/19829
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
diff --git a/src/syscall/route_bsd.go b/src/syscall/route_bsd.go
index c635a13..d9b6697 100644
--- a/src/syscall/route_bsd.go
+++ b/src/syscall/route_bsd.go
@@ -138,7 +138,7 @@
 	//
 	// - The kernel form appends leading bytes to the prefix field
 	//   to make the <length, prefix> tuple to be conformed with
-	//   the routing messeage boundary
+	//   the routing message boundary
 	l := int(rsaAlignOf(int(b[0])))
 	if len(b) < l {
 		return nil, EINVAL