Merge branch 'lh/submodule'

* lh/submodule:
  gitmodules(5): remove leading period from synopsis
  Add gitmodules(5)
  git-submodule: give submodules proper names
  Rename sections from "module" to "submodule" in .gitmodules
  git-submodule: remember to checkout after clone
  t7400: barf if git-submodule removes or replaces a file

diff --cc Documentation/Makefile
Simple merge