documentation: arm: sunxi: Allwinner H2+/H3 update

Replaced the link to the datasheet by a link to the current version.
Signed-off-by: Wilken Gottwalt <wilken.gottwalt@mailbox.org>
Link: https://lore.kernel.org/r/20200923065954.GA22809@monster.powergraphx.localSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/arm/sunxi.rst

@@ -108,7 +108,7 @@ SunXi family
 
         * Datasheet
 
-          http://dl.linux-sunxi.org/H3/Allwinner_H3_Datasheet_V1.0.pdf
+          https://linux-sunxi.org/images/4/4b/Allwinner_H3_Datasheet_V1.2.pdf
 
       - Allwinner R40 (sun8i)