maintainers: Fix path of Marvell documentation

Change-Id: Idd5a2b700b936b22e94194dfadee68b968d03380
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/maintainers.rst b/maintainers.rst
index e807f18..37766ed 100644
--- a/maintainers.rst
+++ b/maintainers.rst
@@ -103,7 +103,7 @@
 --------------------------------------
 :M: Konstantin Porotchkin <kostap@marvell.com>
 :G: `kostapr`_
-:F: docs/plat/marvell/
+:F: docs/marvell/
 :F: plat/marvell/
 :F: drivers/marvell/
 :F: tools/marvell/