Update git submodules

* Update docs/submodules/qtip from branch 'master'
  - update documents

    - fix outdated info
    - correct mistakes

    Change-Id: I8ac41e69d4ba6c2120c74c1af405083918282e21
    Signed-off-by: zhihui wu <wu.zhihui1@zte.com.cn>

diff --git a/docs/submodules/qtip b/docs/submodules/qtip
index 2f9ea59..879963d 160000 (submodule)
--- a/docs/submodules/qtip
+++ b/docs/submodules/qtip
@@ -1 +1 @@
-Subproject commit 2f9ea59dee331cbf61b1cf1bf6e00cbe3ab672d4
+Subproject commit 879963d90e74a4fd003bb73e8d4e50e51679f923