Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - System preparation guide

    Change-Id: I4fc982d7037466b48424b7ce97d6207fbe44a09b
    Signed-off-by: Wenjing Chu <chu.wenjing@gmail.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 413355a..529bc14 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 413355acbcb70074d6861754ad8eb3de0423c417
+Subproject commit 529bc14bb2a255df72b5196ac70b5d1579c98eac