Update git submodules

* Update docs/submodules/pharos from branch 'master'
  - minor changes

    missing comments in https://gerrit.opnfv.org/gerrit/#/c/41711/

    Change-Id: I718a2c5b06a38700f739fe23e36f535562c2a90d
    Signed-off-by: Julien <zhang.jun3g@zte.com.cn>

diff --git a/docs/submodules/pharos b/docs/submodules/pharos
index f27d287..3d98d06 160000 (submodule)
--- a/docs/submodules/pharos
+++ b/docs/submodules/pharos
@@ -1 +1 @@
-Subproject commit f27d287440332840e2a2eb657351aa029c576fc3
+Subproject commit 3d98d06d697d38fd6bcbf66b29eecd1b61d0ae0b