Update git submodules

* Update docs/submodules/openretriever from branch 'master'
  - fix rst doc8 issues

    Change-Id: I3d95cef3b5c9965ab9d00d7a778101d51da5331b
    Signed-off-by: Guo Ruijing <ruijing.guo@intel.com>

diff --git a/docs/submodules/openretriever b/docs/submodules/openretriever
index ee1b670..dbf2942 160000 (submodule)
--- a/docs/submodules/openretriever
+++ b/docs/submodules/openretriever
@@ -1 +1 @@
-Subproject commit ee1b670eac051fcab76dda955b6b0aa5afb5161e
+Subproject commit dbf294252cc8b418d920dcd94749630d741c8bb9