Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "add fraser doctor.yaml"
  - add fraser doctor.yaml

    Change-Id: I087b16302226eca76d8842be0343781990345f45
    Signed-off-by: Tomi Juvonen <tomi.juvonen@nokia.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 4935770..523559b 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 4935770c3b592b01e5710703dcfd2e97684b5b3b
+Subproject commit 523559bbda53d611698400ec01d7f58db7a16491