Update git submodules

* Update docs/submodules/fds from branch 'stable/danube'
  - FDS release notes for D2.0

    Change-Id: I1d63427ac32b69816540cebc4907e44b39da5742
    Signed-off-by: Frank Brockners <fbrockne@cisco.com>
    (cherry picked from commit 92a43cbc94912a27489154edb6404438ce85d822)

diff --git a/docs/submodules/fds b/docs/submodules/fds
index 606662e..a588a97 160000 (submodule)
--- a/docs/submodules/fds
+++ b/docs/submodules/fds
@@ -1 +1 @@
-Subproject commit 606662ebc55af621bf62991668cb8a27ea6eb334
+Subproject commit a588a9718dc080b249508edf9d3d08b20306adc1