ipv6.7: minor: wording and grammar fixes

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man7/ipv6.7

@@ -26,39 +26,39 @@ is based on the BSD sockets interface; see
 .BR socket (7).
 .PP
 The IPv6 API aims to be mostly compatible with the
-.BR ip (7)
-v4 API.
+IPv4 API (see
+.BR ip (7)).
 Only differences are described in this man page.
 .PP
 To bind an
 .B AF_INET6
-socket to any process the local address should be copied from the
+socket to any process, the local address should be copied from the
 .I in6addr_any
 variable which has
 .I in6_addr
 type.
-In static initializations
+In static initializations,
 .B IN6ADDR_ANY_INIT
 may also be used, which expands to a constant expression.
-Both of them are in network order.
+Both of them are in network byte order.
 .PP
 The IPv6 loopback address (::1) is available in the global
 .I in6addr_loopback
 variable.
-For initializations
+For initializations,
 .B IN6ADDR_LOOPBACK_INIT
 should be used.
 .PP
 IPv4 connections can be handled with the v6 API by using the
 v4-mapped-on-v6 address type;
-thus a program only needs only to support this API type to
+thus a program only needs to support this API type to
 support both protocols.
 This is handled transparently by the address
-handling functions in libc.
+handling functions in the C library.
 .PP
 IPv4 and IPv6 share the local port space.
 When you get an IPv4 connection
-or packet to a IPv6 socket its source address will be mapped
+or packet to a IPv6 socket, its source address will be mapped
 to v6 and it will be mapped to v6.
 .SS "Address Format"
 .in +4n
@@ -90,7 +90,7 @@ is the IPv6 flow identifier;
 .I sin6_addr
 is the 128-bit IPv6 address.
 .I sin6_scope_id
-is an ID of depending of on the scope of the address.
+is an ID depending on the scope of the address.
 It is new in Linux 2.4.
 Linux only supports it for link scope addresses, in that case
 .I sin6_scope_id