Update git submodules

* Update docs/submodules/doctor from branch 'master'
  - Updated from global requirements

    Change-Id: If61652d0dc7734b4fcc8678cdc425121d0fdd580
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/doctor b/docs/submodules/doctor
index f106c5a..e172646 160000 (submodule)
--- a/docs/submodules/doctor
+++ b/docs/submodules/doctor
@@ -1 +1 @@
-Subproject commit f106c5a12724c684d747cf7f309f0ccc8b86cc61
+Subproject commit e172646a5957944bb232eee36bd7596e863b1b5a