Merge branch 'wk/doc-in-linux-3.x-era'

Update documentation to match more recent realities.

* wk/doc-in-linux-3.x-era:
  Documentation: Update 'linux-2.6.git' -> 'linux.git'
  Documentation: Update the NFS remote examples to use the staging repo
  doc/clone: Pick more compelling paths for the --reference example
  doc/clone: Remove the '--bare -l -s' example

diff --cc Documentation/user-manual.txt
Simple merge