revise comment, this function is no longer checking execpromises string itself

Author: jrick

unix/pledge_openbsd.go

@@ -129,8 +129,7 @@ func majmin() (major int, minor int, err error) {
 // supportsExecpromises checks for availability of the execpromises argument to
 // the pledge(2) syscall based on the running OpenBSD version.
 func supportsExecpromises(maj, min int) error {
-	// If OpenBSD <= 6.2 and execpromises is not empty,
-	// return an error - execpromises is not available before 6.3
+	// execpromises is not available before 6.3
 	if maj < 6 || (maj == 6 && min <= 2) {
 		return fmt.Errorf("cannot use execpromises on OpenBSD %d.%d", maj, min)
 	}