code/docs: Use correct case for IPv4 and IPv6

For consistency, as we seem to have a bit of a mixed bag, changed all
instances of ipv4 and ipv6 in comments and documentations to use the
correct case.

docs/FAQ

@@ -1274,7 +1274,7 @@ FAQ
   you want to change name resolver function you must rebuild libcurl and tell
   it to use a different function.
 
-  - The non-ipv6 resolver that can use one out of four host name resolve calls
+  - The non-IPv6 resolver that can use one out of four host name resolve calls
     (depending on what your system supports):
 
       A - gethostbyname()
@@ -1282,15 +1282,15 @@ FAQ
       C - gethostbyname_r() with 5 arguments
       D - gethostbyname_r() with 6 arguments
 
-  - The ipv6-resolver that uses getaddrinfo()
+  - The IPv6-resolver that uses getaddrinfo()
 
   - The c-ares based name resolver that uses the c-ares library for resolves.
     Using this offers asynchronous name resolves.
 
   - The threaded resolver (default option on Windows). It uses:
 
-      A - gethostbyname() on plain ipv4 hosts
-      B - getaddrinfo() on ipv6-enabled hosts
+      A - gethostbyname() on plain IPv4 hosts
+      B - getaddrinfo() on IPv6 enabled hosts
 
   Also note that libcurl never resolves or reverse-lookups addresses given as
   pure numbers, such as 127.0.0.1 or ::1.

docs/TODO

@@ -135,7 +135,7 @@
 
  Use 'struct lifreq' and SIOCGLIFADDR instead of 'struct ifreq' and
  SIOCGIFADDR on newer Solaris versions as they claim the latter is obsolete.
- To support ipv6 interface addresses for network interfaces properly.
+ To support IPv6 interface addresses for network interfaces properly.
 
 1.4 signal-based resolver timeouts
 

docs/examples/asiohiper.cpp

@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 2012 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -336,7 +336,7 @@ static curl_socket_t opensocket(void *clientp,
 
   curl_socket_t sockfd = CURL_SOCKET_BAD;
 
-  /* restrict to ipv4 */
+  /* restrict to IPv4 */
   if (purpose == CURLSOCKTYPE_IPCXN && address->family == AF_INET)
   {
     /* create a tcp socket object */