Makefile: a minor fix [1/1]

PD#SWPL-66582

Problem:
a minor fix

Solution:
a minor fix

Verify:
ad409_a113l

Signed-off-by: Kelvin Zhang <kelvin.zhang@amlogic.com>
Change-Id: Ie517eebd60a7d95b42d7b81299f4b92b8b799a4c
diff --git a/Makefile b/Makefile
index be7e9c2..36045cf 100755
--- a/Makefile
+++ b/Makefile
@@ -225,7 +225,7 @@
 .PHONY: docs
 docs:
 	@ if [ ! -d $($@_BUILD_DIR) ]; then mkdir -p $($@_BUILD_DIR); fi
-	(cd $($@_BUILD_DIR); \
+	@ (cd $($@_BUILD_DIR); \
 	cmake $($@_DIR); \
 	make)