syscall: don't display syscall prototype lines on godoc

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/90810045

src/pkg/syscall/syscall_solaris.go

@@ -333,6 +333,7 @@ func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, error) {
 }
 
 //sys	accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error) = libsocket.accept
+
 func Accept(fd int) (nfd int, sa Sockaddr, err error) {
 	var rsa RawSockaddrAny
 	var len _Socklen = SizeofSockaddrAny
@@ -386,6 +387,7 @@ func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (err error) {
 }
 
 //sys	sendmsg(s int, msg *Msghdr, flags int) (n int, err error) = libsocket.sendmsg
+
 func SendmsgN(fd int, p, oob []byte, to Sockaddr, flags int) (n int, err error) {
 	var ptr unsafe.Pointer
 	var salen _Socklen