Update git submodules

Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 14fc37a82d89d79faf764832fd4386a664654d7a
  - Merge "fix architecture.rst formatting"
  - fix architecture.rst formatting

    Fixed Warning message on SO Architecture page in documentation:
    System Message: WARNING/2
    (/home/docs/checkouts/readthedocs.org/user_builds/onap/checkouts/latest/docs/submodules/so.git/docs/architecture/architecture.rst, line 6)
    Title underline too short.

    Change-Id: Ibf019132e64d1fef3f62efe7a1ce0cbafac647a5
    Issue-ID: SO-2146
    Signed-off-by: k.kazak <k.kazak@samsung.com>