Update git submodules

* Update docs/submodules/doctor from branch 'master'
  - Fix release notes reference

    Change-Id: I4351600917570e3b9eddeefab43fee7882d20ddf
    Signed-off-by: Yujun Zhang <zhang.yujunz@zte.com.cn>

diff --git a/docs/submodules/doctor b/docs/submodules/doctor
index 7a14778..bcffa7e 160000 (submodule)
--- a/docs/submodules/doctor
+++ b/docs/submodules/doctor
@@ -1 +1 @@
-Subproject commit 7a14778cf61c8a5000dbfb1600510440cad39e9f
+Subproject commit bcffa7ef747c75a18d3b38182737222a6010ce36