docs(marvell): fix typo 8K => A8K

It is Armada 80x0, hence A8K (like A7K).

Change-Id: I4888b472204ecd19bfe9b8c89adaa1a99b01dd5f
Signed-off-by: Pali Rohár <pali@kernel.org>
diff --git a/docs/plat/marvell/armada/uart-booting.rst b/docs/plat/marvell/armada/uart-booting.rst
index 06601d1..04ce464 100644
--- a/docs/plat/marvell/armada/uart-booting.rst
+++ b/docs/plat/marvell/armada/uart-booting.rst
@@ -79,10 +79,10 @@
 bootrom during transferring of image files. This mini terminal can be quit by CTRL-\\ + C keypress.
 
 
-A7K/8K/CN913x UART image downloading
-------------------------------------
+A7K/A8K/CN913x UART image downloading
+-------------------------------------
 
-A7K/8K/CN913x uses same image ``flash-image.bin`` for both flashing and booting over UART.
+A7K/A8K/CN913x uses same image ``flash-image.bin`` for both flashing and booting over UART.
 For downloading image over UART it is possible to use mvebu64boot tool.
 
 Compilation: