ipaddr: fix typo [ci skip]

* lib/ipaddr.rb: [DOC] fix documentation of IN6MASK to mention
  IPv6.  [Fix GH-1349]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55096 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Sat May 21 11:18:42 2016  Evgeni Golov  <evgeni@golov.de>
+
+	* lib/ipaddr.rb: [DOC] fix documentation of IN6MASK to mention
+	  IPv6.  [Fix GH-1349]
+
 Sat May 21 11:12:53 2016  Dan Martinez  <dfm@razorwind.org>
 
 	* io.c (Init_IO): [DOC] define dummy ARGF instead of ARGF.class to

lib/ipaddr.rb

@@ -43,7 +43,7 @@ class IPAddr
 
   # 32 bit mask for IPv4
   IN4MASK = 0xffffffff
-  # 128 bit mask for IPv4
+  # 128 bit mask for IPv6
   IN6MASK = 0xffffffffffffffffffffffffffffffff
   # Format string for IPv6
   IN6FORMAT = (["%.4x"] * 8).join(':')