hwmon: (DS620) Update broken Datasheet URL in driver documentation

The URL for the DS620 datasheet has changed. Update it to reflect the
current location.

Signed-off-by: Okan Akyuz <okan.akyuz.linux@gmail.com>
Link: https://lore.kernel.org/r/20251215204423.80242-1-okan.akyuz.linux@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Author: Okan Akyuz

Documentation/hwmon/ds620.rst

@@ -7,9 +7,9 @@ Supported chips:
 
     Prefix: 'ds620'
 
-    Datasheet: Publicly available at the Dallas Semiconductor website
+    Datasheet: Publicly available at the Analog Devices website
 
-	       http://www.dalsemi.com/
+	https://www.analog.com/media/en/technical-documentation/data-sheets/DS620.pdf
 
 Authors:
 	Roland Stigge <stigge@antcom.de>