Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - [license] Cleanup duplicate LICENSE files
    
    github.com auto-detects the licensing terms if and only if the root
    directory contains a single license file.
    
    To leverage this, distinguish via main README file between:
    - main fuel repository license (apache-2.0);
    - documentation license (cc-by-4.0);
    - 3rd party licenses (non-exhaustive list for 3rd party projects);
    
    While at it, add missing license headers to docs auxiliary files.
    
    Change-Id: I7bd25573b0c2b8d16881c7ae72198f5981683c08
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    

1 files changed, 0 insertions, 0 deletions

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
-Subproject b7383cda9b6ffdaf6dd8bb07dc74e1c8a7046db
+Subproject 650b54aeead7eee047ed17eacb4bc401c936a0a