Merge branch 'ms/doc-worktree-side-by-side' into seen

Document "git worktree add" and use of out-of-tree worktrees with
examples.

Comments?

* ms/doc-worktree-side-by-side:
  amend! doc: git-worktree: Add side by side branch checkout example
  doc: git-worktree: Add side by side branch checkout example
  amend! doc: git-worktree: Link to examples
  doc: git-worktree: Link to examples

diff --cc Documentation/git-worktree.adoc
Simple merge