Update git submodules

* Update docs/submodules/openretriever from branch 'master'
  - create new directory for release E

    Change-Id: I9da83cac279d9958fb58a67254b7861e231455cc
    Signed-off-by: Xuan Jia <jason.jiaxuan@gmail.com>

diff --git a/docs/submodules/openretriever b/docs/submodules/openretriever
index b7554f8..284d0db 160000 (submodule)
--- a/docs/submodules/openretriever
+++ b/docs/submodules/openretriever
@@ -1 +1 @@
-Subproject commit b7554f86392beedae07cf5e103d2da4c2c8971a1
+Subproject commit 284d0db5d197781c3c2b1c968783ac4dbdea95de