Update git submodules

* Update docs/submodules/moon from branch 'stable/euphrates'
  - Update index in the doc tree.

    Change-Id: I533c953a1f785d47a73a43a7ee0a675400735740

diff --git a/docs/submodules/moon b/docs/submodules/moon
index 29cdab6..2c38000 160000 (submodule)
--- a/docs/submodules/moon
+++ b/docs/submodules/moon
@@ -1 +1 @@
-Subproject commit 29cdab640fea67115032a34ce9a5a109ee44b6ee
+Subproject commit 2c380003fa911fdfad85d2c7164b95160eb54963