Update git submodules

* Update docs/submodules/doctor from branch 'master'
  - Doctor releasenotes Fraser 6.2

    Change-Id: I18625dc03f050e2d424cfcd1bd10534647db5525
    Signed-off-by: Tomi Juvonen <tomi.juvonen@nokia.com>

diff --git a/docs/submodules/doctor b/docs/submodules/doctor
index 2043cee..72d7719 160000 (submodule)
--- a/docs/submodules/doctor
+++ b/docs/submodules/doctor
@@ -1 +1 @@
-Subproject commit 2043ceeb08c1eca849daeb2b3696d385425ba061
+Subproject commit 72d7719a1fe35fd0c6e3171e0e001f3b7eacf926