Update git submodules

* Update docs/submodules/doctor from branch 'master'
  - optimize the fault notification test

    Change-Id: I47572b4515049c49f9aa04bf7984757779a605f3
    Signed-off-by: dongwenjuan <dong.wenjuan@zte.com.cn>

diff --git a/docs/submodules/doctor b/docs/submodules/doctor
index 5bbd044..631c3f9 160000 (submodule)
--- a/docs/submodules/doctor
+++ b/docs/submodules/doctor
@@ -1 +1 @@
-Subproject commit 5bbd044650de0ab4179101bb3156dd315be9391f
+Subproject commit 631c3f99f0e499edd1adcbc7550dd3d0de393e31