Update git submodules

* Update docs/submodules/doctor from branch 'master'
  - Minor docs updates

    Version history is not needed in the final version. Page navigation is
    availalble on the left side on docs.opnfv.org

    Change-Id: If1edb5f8da407b6bce2f6aeccd53aca9c8494a1a
    Signed-off-by: Sofia Wallin <sofia.wallin@est.tech>

diff --git a/docs/submodules/doctor b/docs/submodules/doctor
index 5b3f593..dafdfcf 160000 (submodule)
--- a/docs/submodules/doctor
+++ b/docs/submodules/doctor
@@ -1 +1 @@
-Subproject commit 5b3f5937e7b861fca46b2a6b2d6708866b800f95
+Subproject commit dafdfcfad6866d7c413d4b8d5a9d25f3ab1f76dc