Update git submodules

* Update docs/submodules/orchestra from branch 'stable/euphrates'
  - Removed Table of content

    Readthedocs generate TOC so it's not needed to add within the
    documents.

    Change-Id: I1689567763f3de154b157914301538d181f540c6
    Signed-off-by: Sofia Wallin <sofia.wallin@ericsson.com>
    (cherry picked from commit 9cf364f27fd08431bfbcd58d43a5bbc18739bcb9)

diff --git a/docs/submodules/orchestra b/docs/submodules/orchestra
index 6ef070c..f739870 160000 (submodule)
--- a/docs/submodules/orchestra
+++ b/docs/submodules/orchestra
@@ -1 +1 @@
-Subproject commit 6ef070cf22c78cac2a622e1fd37b5ea727ae31d2
+Subproject commit f7398707955225379babe44d3e00e74b25b15475