Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  to d93a6b1018ac65ab709b866350489bb182766f8f
  - Update Jenkins Connection Documentation

    Majority of this change is fixing the syntax to use '..code::' blocks,
    wrapping text >80 characters, and fixing indentation which cause things
    to show up as quote blocks.

    The other main change was updating the link to support when requesting
    the server be connected - helpdesk@ has been replaced by
    support.linuxfoundation.org

    Change-Id: Iee4d1152edc519b7299ffe3f8e9c11b6209559b2
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>