Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 2a2e7191e0830e952ac2dfa6774c5021a42f6a96
  - [fuel] Add link to release notes

    Signed-off-by: Cristina Pauna <cristina.pauna@enea.com>
    Change-Id: Iafa10adf857461d4e61bd3f98d3fa7ae0046c729

diff --git a/docs/submodules/releng b/docs/submodules/releng
index ed314e9..2a2e719 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit ed314e905a86fff58c3113779019c42e4f34f149
+Subproject commit 2a2e7191e0830e952ac2dfa6774c5021a42f6a96