Update git submodules

* Update docs/submodules/qtip from branch 'stable/euphrates'
  - Merge "Add release note for Euphrates" into stable/euphrates
  - Add release note for Euphrates

    Change-Id: I673671a6d02fea007aebaa02d027cfdb670cf044
    Signed-off-by: Yujun Zhang <zhang.yujunz@zte.com.cn>
    (cherry picked from commit 344c40c9d0bc196dafae385b3c6536ce1640ebfd)

diff --git a/docs/submodules/qtip b/docs/submodules/qtip
index 931a3ca..af983e4 160000 (submodule)
--- a/docs/submodules/qtip
+++ b/docs/submodules/qtip
@@ -1 +1 @@
-Subproject commit 931a3ca2315357555bae21ec151450cc20556bb3
+Subproject commit af983e483333615d6528df2489975c866c3f3e54