Update git submodules

* Update docs/submodules/qtip from branch 'stable/danube'
  - Fix document title

    Change-Id: Ie4865676420fc573ebba6f019f5bbfafdf3e38b4
    Signed-off-by: Yujun Zhang <zhang.yujunz@zte.com.cn>
    (cherry picked from commit 0c279edfee98729cf72da837e1236516676ffc61)

diff --git a/docs/submodules/qtip b/docs/submodules/qtip
index a13ffed..33dd7bd 160000 (submodule)
--- a/docs/submodules/qtip
+++ b/docs/submodules/qtip
@@ -1 +1 @@
-Subproject commit a13ffed7c69ae074d80d12152d267e6cf9954481
+Subproject commit 33dd7bd8322d3224e382756ca83d0f6a4f02da06