Update git submodules

* Update docs/submodules/qtip from branch 'stable/danube'
  - Merge "update user docs" into stable/danube
  - update user docs

    Change-Id: I7a7a1343c457fe1c3063dfeafa079154d495eac0
    Signed-off-by: wu.zhihui <wu.zhihui1@zte.com.cn>
    (cherry picked from commit 16f2362065636b833c31722c778e485f62acb981)

diff --git a/docs/submodules/qtip b/docs/submodules/qtip
index bd46004..e35bf4e 160000 (submodule)
--- a/docs/submodules/qtip
+++ b/docs/submodules/qtip
@@ -1 +1 @@
-Subproject commit bd46004eab861c632439d5479a1aaeb305a68ae0
+Subproject commit e35bf4e340cbc3b971327ad51445c766c7c3803e