Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "[virtual] Rename all to drop virtual prefix"
  - [virtual] Rename all to drop virtual prefix

    JIRA: FUEL-322

    Change-Id: I99c4b1774a7c3afbc834a6f6e8468f7baf1bc329
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 0f1bef5..2f874c8 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 0f1bef52ce8e7040934ec16894b266579bb82c58
+Subproject commit 2f874c8729bd80f34e5994fe07f116c82c9b1695