Update git submodules

* Update docs/submodules/pharos from branch 'master'
  - restruct documents according to opnfvdocs

    Use only development and release for we don't have test codes for now.

    JIRA: PHAROS-311

    Change-Id: Iacfcaba81a7a52e09cf999b8603cc9dc2f8f2b97
    Signed-off-by: Julien <zhang.jun3g@zte.com.cn>

diff --git a/docs/submodules/pharos b/docs/submodules/pharos
index 34f15a0..aa88673 160000 (submodule)
--- a/docs/submodules/pharos
+++ b/docs/submodules/pharos
@@ -1 +1 @@
-Subproject commit 34f15a071a9df12986654593193235a21a774fc8
+Subproject commit aa88673c38be12368dead5e8241fb915d790c431