Raw: Fix a comment

[skip ci]

Author: fxlb

print-raw.c

@@ -31,7 +31,7 @@
 #include "ip.h"
 
 /*
- * The DLT_RAW packet has no header. It contains a raw IP packet.
+ * The DLT_RAW packet has no header. It contains a raw IPv4 or IPv6 packet.
  */
 
 void