Comments Fix for Doxygen documentation

src/core/ipv4/autoip.c

@@ -1,7 +1,7 @@
 /**
  * @file
- *
  * AutoIP Automatic LinkLocal IP Configuration
+ *
  */
 
 /*

src/core/ipv4/icmp.c

@@ -1,3 +1,9 @@
+/**
+ * @file
+ * ICMP - Internet Control Message Protocol
+ *
+ */
+
 /*
  * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
  * All rights reserved.

src/core/ipv4/igmp.c

@@ -1,7 +1,7 @@
 /**
  * @file
- *
  * IGMP - Internet Group Management Protocol
+ *
  */
 
 /*
@@ -577,7 +577,7 @@ igmp_ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
 /**
  * Send an igmp packet to a specific group.
  *
- * @param the group to which to send the packet
+ * @param group the group to which to send the packet
  * @param type the type of igmp packet to send
  */
 void

src/core/ipv4/ip.c

@@ -1,10 +1,11 @@
-/* @file
- *
- * This is the IP layer implementation for incoming and outgoing IP traffic.
+/**
+ * @file
+ * This is the IPv4 layer implementation for incoming and outgoing IP traffic.
  * 
  * @see ip_frag.c
  *
  */
+
 /*
  * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
  * All rights reserved.

src/core/ipv4/ip_addr.c

@@ -1,3 +1,9 @@
+/**
+ * @file
+ * This is the IPv4 address tools implementation.
+ *
+ */
+
 /*
  * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
  * All rights reserved. 

src/core/ipv4/ip_frag.c

@@ -1,6 +1,6 @@
-/* @file
- * 
- * This is the IP packet segmentation and reassembly implementation.
+/**
+ * @file
+ * This is the IPv4 packet segmentation and reassembly implementation.
  *
  */