Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Generalize Gerrit non-voting Review Macro Name"
  - Generalize Gerrit non-voting Review Macro Name

    This patch updates the 'report-docs-build-result-to-gerrit' macro name
    to reflect that it can work well for more than just the opnfvdocs project.

    To take advantage of this macro a build merely needs to write
    out the file 'gerrit_comment.txt' with the information they want posted
    back to gerrit, and include the macro in the list of builders.

    Change-Id: Ifbdc5734fe7e7231be0cfd16d6b8d69cb1383bfd
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 099b8bd..06a9d73 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 099b8bd8cf78c9eafb034ad9b031c064378a201e
+Subproject commit 06a9d7383889fbd8f4d1351ae6c9908fd1f248b6