[PATCH 2/4] docs: zh_CN: amu.rst: fix document title markup

[Mauro Carvalho Chehab]

As warned by Sphinx 2.4.4:
	.../Documentation/translations/zh_CN/arm64/amu.rst:7: WARNING: Title overline too short.

Increase its size.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
---
 Documentation/translations/zh_CN/arm64/amu.rst | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/translations/zh_CN/arm64/amu.rst b/Documentation/translations/zh_CN/arm64/amu.rst
index bd875f221330..ab7180f91394 100644
--- a/Documentation/translations/zh_CN/arm64/amu.rst
+++ b/Documentation/translations/zh_CN/arm64/amu.rst
@@ -4,9 +4,9 @@
 
 Translator: Bailu Lin <bailu.lin@xxxxxxxx>
 
-=================================
+==================================
 AArch64 Linux 中扩展的活动监控单元
-=================================
+==================================
 
 作者: Ionela Voinescu <ionela.voinescu@xxxxxxx>
 
-- 
2.26.2