all: use "reports whether" in place of "returns true if(f)"

Comment changes only.

Change-Id: I56848814564c4aa0988b451df18bebdfc88d6d94
Reviewed-on: https://go-review.googlesource.com/7721
Reviewed-by: Rob Pike <r@golang.org>

handshake_server.go

@@ -238,7 +238,7 @@ Curves:
 	return false, nil
 }
 
-// checkForResumption returns true if we should perform resumption on this connection.
+// checkForResumption reports whether we should perform resumption on this connection.
 func (hs *serverHandshakeState) checkForResumption() bool {
 	c := hs.c