hwmon: (max6620) Update broken Datasheet URL in driver documentation

The URL for the MAX6620 datasheet has changed. Update it to reflect the
current location.
Signed-off-by: Okan Akyuz <okanakyuz@okanakyuz.com>
Link: https://lore.kernel.org/r/20240216075212.69118-1-okanakyuz@okanakyuz.com
[groeck: Updated subject and patch description]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/hwmon/max6620.rst

@@ -11,7 +11,7 @@ Supported chips:
 
     Addresses scanned: none
 
-    Datasheet: http://pdfserv.maxim-ic.com/en/ds/MAX6620.pdf
+    Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/max6620.pdf
 
 Authors:
     - L\. Grunenberg <contact@lgrunenberg.de>