Update git submodules

* Update docs/submodules/doctor from branch 'stable/gambia'
  - fix building docs

    Change-Id: Ie9d07f5a039e43f6468cabb41c610fd642e4c825
    Signed-off-by: Tomi Juvonen <tomi.juvonen@nokia.com>
    (cherry picked from commit 5b3f5937e7b861fca46b2a6b2d6708866b800f95)

diff --git a/docs/submodules/doctor b/docs/submodules/doctor
index aeb3941..99d9f3d 160000 (submodule)
--- a/docs/submodules/doctor
+++ b/docs/submodules/doctor
@@ -1 +1 @@
-Subproject commit aeb3941f7353fee57b42d50163e76fa14db4faf9
+Subproject commit 99d9f3d695e1890dc00e7f4dd554418cec57584b