Update git submodules

* Update docs/submodules/clover from branch 'master'
  - Merge "Add section to help user understand how logging works"
  - Add section to help user understand how logging works

    Change-Id: Iebfb747450cc08e930eabd36a87670236b23ffff
    Signed-off-by: Yujun Zhang <zhang.yujunz@zte.com.cn>

diff --git a/docs/submodules/clover b/docs/submodules/clover
index af5f78f..6774a5b 160000 (submodule)
--- a/docs/submodules/clover
+++ b/docs/submodules/clover
@@ -1 +1 @@
-Subproject commit af5f78f5221c5b55cff1c45fa4f5a879a772b796
+Subproject commit 6774a5be4f59b325af1d51af3b88d06edd9f76c0