Update git submodules

* Update docs/submodules/doctor from branch 'stable/euphrates'
  - update the docs of testing

    Change-Id: Ibfc04831f12778cb0cc3769781b864a56a581881
    Signed-off-by: dongwenjuan <dong.wenjuan@zte.com.cn>
    (cherry picked from commit b8c169d1f7358645514f93f68b966f33c5af7e56)

diff --git a/docs/submodules/doctor b/docs/submodules/doctor
index b42b9f7..bca7b0f 160000 (submodule)
--- a/docs/submodules/doctor
+++ b/docs/submodules/doctor
@@ -1 +1 @@
-Subproject commit b42b9f7eaeaf3246c934187268d9b9e20b263935
+Subproject commit bca7b0f906b3c325b76308f139aca72f190f9f37