https://git.ruby-lang.org/ruby.git/commit/?id=e40fa6c480

From e40fa6c480b58a8d1699b24193cf67945eaec202 Mon Sep 17 00:00:00 2001
From: Sutou Kouhei <kou@c...>
Date: Tue, 20 Sep 2022 16:09:42 +0900
Subject: [DOC] socket: fix wrong sample addresses (#6372)

IPv6 link local address is fe80::/10 not ff80::/10:

https://www.rfc-editor.org/rfc/rfc4291.html

    Link-Local unicast   1111111010           FE80::/10       2.5.6

IPv6 (deprecated) site local address is fec0::/10 not ffc0::/10:

https://www.rfc-editor.org/rfc/rfc3513.html

    Site-local unicast   1111111011           FEC0::/10       2.5.6
---
 ext/socket/raddrinfo.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ext/socket/raddrinfo.c b/ext/socket/raddrinfo.c
index b914aa6520..a4e1ed37a3 100644
--- a/ext/socket/raddrinfo.c
+++ b/ext/socket/raddrinfo.c
@@ -2192,7 +2192,7 @@ addrinfo_ipv6_multicast_p(VALUE self) https://github.com/ruby/ruby/blob/trunk/ext/socket/raddrinfo.c#L2192
 }
 
 /*
- * Returns true for IPv6 link local address (ff80::/10).
+ * Returns true for IPv6 link local address (fe80::/10).
  * It returns false otherwise.
  */
 static VALUE
@@ -2204,7 +2204,7 @@ addrinfo_ipv6_linklocal_p(VALUE self) https://github.com/ruby/ruby/blob/trunk/ext/socket/raddrinfo.c#L2204
 }
 
 /*
- * Returns true for IPv6 site local address (ffc0::/10).
+ * Returns true for IPv6 site local address (fec0::/10).
  * It returns false otherwise.
  */
 static VALUE
-- 
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