syscall: fix ParseRoutingSockaddr name in docs

Change-Id: I3870150fc8e713f6164371299c029b31f18f250a
Reviewed-on: https://go-review.googlesource.com/17426
Reviewed-by: Minux Ma <[email protected]>

Author: yannk

src/syscall/route_bsd.go

@@ -339,7 +339,7 @@ func ParseRoutingMessage(b []byte) (msgs []RoutingMessage, err error) {
 	return msgs, nil
 }
 
-// ParseRoutingMessage parses msg's payload as raw sockaddrs and
+// ParseRoutingSockaddr parses msg's payload as raw sockaddrs and
 // returns the slice containing the Sockaddr interfaces.
 func ParseRoutingSockaddr(msg RoutingMessage) ([]Sockaddr, error) {
 	sas, err := msg.sockaddr()