Update git submodules

* Update docs/submodules/doctor from branch 'master'
  - Updated the testing doc

    Remove references to bash script (code now removed), updated links

    Change-Id: I6fb66b7700ee044f125cd283645dfa07d2c63aac
    Signed-off-by: Bertrand Souville <souville@docomolab-euro.com>

diff --git a/docs/submodules/doctor b/docs/submodules/doctor
index f06386c..db6684c 160000 (submodule)
--- a/docs/submodules/doctor
+++ b/docs/submodules/doctor
@@ -1 +1 @@
-Subproject commit f06386c6b436a0adce7b96c6a1d59b5d02ed31fb
+Subproject commit db6684c6cbdec3d41d0e555793a275879bbb26bc