Update git submodules

* Update docs/submodules/modeling/modelspec.git from branch 'master'
  to 996a9240b5ecd4cc1e3e60ed71600f51227ae91d
  - Create Slice Model

    Update nsStatus stereotype, create "Network Slicing Model" and "Service
    Datatypes" diagrams, update Slice Model based on current proposal on
    wiki page. This is still in working progress.

    Issue-ID: MODELING-104

    Change-Id: I385157b9b42f1399b774a313fbb01fb1e6e9f216

    Change-Id: I385157b9b42f1399b774a313fbb01fb1e6e9f216
    Signed-off-by: guochuyicmri <guochuyi@chinamobile.com>

diff --git a/docs/submodules/modeling/modelspec.git b/docs/submodules/modeling/modelspec.git
index 9089712..996a924 160000 (submodule)
--- a/docs/submodules/modeling/modelspec.git
+++ b/docs/submodules/modeling/modelspec.git
@@ -1 +1 @@
-Subproject commit 90897122329cd8906790ff1f58955275de1efff6
+Subproject commit 996a9240b5ecd4cc1e3e60ed71600f51227ae91d