Update git submodules

* Update docs/submodules/qtip from branch 'master'
  - Merge "Convert ipynb to rst file"
  - Convert ipynb to rst file

    Change-Id: I24e52254670524ff94c26154e8f930e20105ddc9
    Signed-off-by: Yujun Zhang <zhang.yujunz@zte.com.cn>

diff --git a/docs/submodules/qtip b/docs/submodules/qtip
index f4b75e4..e70599b 160000 (submodule)
--- a/docs/submodules/qtip
+++ b/docs/submodules/qtip
@@ -1 +1 @@
-Subproject commit f4b75e4a071c5a29268aec9799116e3eef56b920
+Subproject commit e70599b4b9c23c9861ac670f111d38379505249d