docs: w1: fix w1-netlink invalid URL

The URL in w1-netlink.rst for an example userspace application
has changed. The former URL is no longer valid. Update it to the
github URL.

Fixes: e4e056a ("w1: documentation update")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20251104194403.945611-1-rdunlap@infradead.org>

Author: rddunlap

Documentation/w1/w1-netlink.rst

@@ -196,7 +196,7 @@ Additional documentation, source code examples
 ==============================================
 
 1. Documentation/driver-api/connector.rst
-2. http://www.ioremap.net/archive/w1
+2. https://github.com/bioothod/w1
 
    This archive includes userspace application w1d.c which uses
    read/write/search commands for all master/slave devices found on the bus.