isisd: couple of bug fixes
diff --git a/isisd/isis_pdu.h b/isisd/isis_pdu.h
index 9e21553..3eca731 100644
--- a/isisd/isis_pdu.h
+++ b/isisd/isis_pdu.h
@@ -114,7 +114,7 @@
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | Holding Time | 2
* +-------+-------+-------+-------+-------+-------+-------+-------+
- * | PDU Lenght | 2
+ * | PDU Length | 2
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | R | Priority | 1
* +-------+-------+-------+-------+-------+-------+-------+-------+
@@ -142,7 +142,7 @@
* +-------+-------+-------+-------+-------+-------+-------+-------+
* + Holding Time + 2
* +-------+-------+-------+-------+-------+-------+-------+-------+
- * + PDU Lenght + 2
+ * + PDU Length + 2
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | Local Circuit ID | 1
* +-------+-------+-------+-------+-------+-------+-------+-------+
@@ -202,7 +202,7 @@
/*
* L1 and L2 IS to IS complete sequence numbers PDU header
* +-------+-------+-------+-------+-------+-------+-------+-------+
- * + PDU Lenght + 2
+ * + PDU Length + 2
* +-------+-------+-------+-------+-------+-------+-------+-------+
* + Source ID + id_len + 1
* +-------+-------+-------+-------+-------+-------+-------+-------+