runtime: fix typos in os_linux_arm.go

Change-Id: I750900e0aed9ec528fea3f442c35196773e3ba5e
Reviewed-on: https://go-review.googlesource.com/11163Reviewed-by: Minux Ma <minux@golang.org>

src/runtime/os_linux_arm.go

@@ -47,7 +47,7 @@ func sysargs(argc int32, argv **byte) {
 		switch auxv[i] {
 		case _AT_RANDOM: // kernel provides a pointer to 16-bytes worth of random data
 			startupRandomData = (*[16]byte)(unsafe.Pointer(uintptr(auxv[i+1])))[:]
-			// the pointer provided may not be word alined, so we must to treat it
+			// the pointer provided may not be word aligned, so we must treat it
 			// as a byte array.
 			randomNumber = uint32(startupRandomData[4]) | uint32(startupRandomData[5])<<8 |
 				uint32(startupRandomData[6])<<16 | uint32(startupRandomData[7])<<24