Documentation: arm: marvell: Fix link to armada_1000_pb.pdf document

File armada_1000_pb.pdf is not available on Marvell website anymore.
So update link to webarchive where is backup copy.
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/arm/marvell.rst

@@ -436,7 +436,7 @@ Berlin family (Multimedia Solutions)
   - Flavors:
 	- 88DE3010, Armada 1000 (no Linux support)
 		- Core:		Marvell PJ1 (ARMv5TE), Dual-core
-		- Product Brief:	http://www.marvell.com.cn/digital-entertainment/assets/armada_1000_pb.pdf
+		- Product Brief:	https://web.archive.org/web/20131103162620/http://www.marvell.com/digital-entertainment/assets/armada_1000_pb.pdf
 	- 88DE3005, Armada 1500 Mini
 		- Design name:	BG2CD
 		- Core:		ARM Cortex-A9, PL310 L2CC