Update git submodules

* Update docs/submodules/orchestra from branch 'stable/euphrates'
  - Enable references for documentation

    Change-Id: I5b0ee93630ade8986a6a0eff868dcec12079cdb7
    Signed-off-by: Sofia Wallin <sofia.wallin@ericsson.com>
    (cherry picked from commit 2c7eea345e76a641b65b567f6ebb2bf8b4f3a07b)

diff --git a/docs/submodules/orchestra b/docs/submodules/orchestra
index 9ddde2b..6ef070c 160000 (submodule)
--- a/docs/submodules/orchestra
+++ b/docs/submodules/orchestra
@@ -1 +1 @@
-Subproject commit 9ddde2b8fff89b81fd675eed5af115c0eb0656ae
+Subproject commit 6ef070cf22c78cac2a622e1fd37b5ea727ae31d2