Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Add the docs build job for fuel project"
  - Add the docs build job for fuel project

    Change-Id: I2d0a71fc40a4a6cd1f5b1e63ca429c5b83b7ad00
    Signed-off-by: Cristina Pauna <cristina.pauna@enea.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index fb90e31..8a02240 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit fb90e313dd4721a0c586b50e5a972385736298b1
+Subproject commit 8a022401a11144f90455e94aa110b57a1a7c2909