Update git submodules

* Update docs/submodules/portal.git from branch 'master'
  to f81c0c718043517218d55908bdad0bfcada9a969
  - Merge "Request flow in Portal-BE documentation"
  - Request flow in Portal-BE documentation

    This patch provide request flow model inside portal-BE project.

    This patch also explain package organization in project and acces type
    to objects.

    Issue-ID: PORTAL-710
    Change-Id: I2f74c000ac326c30b283bb893e92df1af4902fc1
    Signed-off-by: Dominik Mizyn <d.mizyn@samsung.com>

diff --git a/docs/submodules/portal.git b/docs/submodules/portal.git
index 77a3669..f81c0c7 160000 (submodule)
--- a/docs/submodules/portal.git
+++ b/docs/submodules/portal.git
@@ -1 +1 @@
-Subproject commit 77a366936ae22566d25b9f6af8492bd7293b50f1
+Subproject commit f81c0c718043517218d55908bdad0bfcada9a969