Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Update link to participation form

    Change-Id: Ice4ac73f8ea7253e5ad510796486afa129f26699
    Signed-off-by: Georg Kunz <georg.kunz@ericsson.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index a5f91fb..3f842d1 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit a5f91fbd49474a88d6a9c92e9da36d2cf20804ac
+Subproject commit 3f842d1ae584959ec9a28c3a4bb6a9161af0fc49