Various clarifications and wording improvements.

man7/ip.7

@@ -135,9 +135,9 @@ when this setting is missing.
 contains the port in network byte order. 
 The port numbers below 1024 are called
 .IR "reserved ports" .
-Only processes with effective user ID 0 or the 
+Only privileged processes (i.e., those having the
 .B CAP_NET_BIND_SERVICE 
-capability may 
+capability) may 
 .BR bind (2)  
 to these sockets. 
 Note that the raw IPv4 protocol as such has no concept of a 
@@ -149,12 +149,13 @@ and
 .I sin_addr 
 is the IP host address.
 The 
-.I addr
+.I s_addr
 member of 
 .I struct in_addr
 contains the host interface address in network order. 
 .I in_addr 
-should be only accessed using the
+should be assigned one of the INADDR_* values (e.g., INADDR_ANY)
+or set using the
 .BR inet_aton (3),
 .BR inet_addr (3),
 .BR inet_makeaddr (3)
@@ -336,9 +337,9 @@ Linux sends
 datagrams first by default,
 but the exact behaviour depends on the configured queueing discipline. 
 .\" FIXME elaborate on this 
-Some high priority levels may require an effective user ID of 0 or the
+Some high priority levels may require superuser privileges (the
 .B CAP_NET_ADMIN
-capability.
+capability).
 The priority can also be set in a protocol independent way by the
 .RB ( SOL_SOCKET ", " SO_PRIORITY )
 socket option (see
@@ -847,18 +848,18 @@ Datagram is bigger than an MTU on the path and it cannot be fragmented.
 .B EACCES
 The user tried to execute an operation without the necessary permissions. 
 These include:
-Sending a packet to a broadcast address without having the 
+sending a packet to a broadcast address without having the 
 .B SO_BROADCAST
-flag set.
-Sending a packet via a 
+flag set;
+sending a packet via a 
 .I prohibit
-route.
-Modifying firewall settings without 
+route;
+modifying firewall settings without superuser privileges (the
 .B CAP_NET_ADMIN
-or effective user ID 0.
-Binding to a reserved port without the
+capability);
+binding to a reserved port without superuser privileges (the
 .B CAP_NET_BIND_SERVICE
-capability or effective user ID 0. 
+capability).
 
 .TP
 .B EADDRINUSE