Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - Merge "Extended PDF support to all baremetal scenarios" into stable/euphrates
  - Extended PDF support to all baremetal scenarios

    JIRA: FUEL-275

    Change-Id: I67e8d7ab95e35c78a4f960a12733124fe7bffaec
    Signed-off-by: Guillermo Herrero <guillermo.herrero@enea.com>
    (cherry picked from commit 809ea60a05f55d98814f8794a46540edcd2b0298)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index a27ad89..1c5912c 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit a27ad89c0d97ff1be7f40af51b59df8d26dc7fe4
+Subproject commit 1c5912c2f528b2c972307f9f9982492754ab233e