[PATCH] git clone depth of 0 not possible.

Currently it is not possible to have a shallow depth of
just 0, i.e. only one commit in that repository after cloning.
The minimum number of commits is 2, caused by depth=1.

I had no good idea how to add this behavior to git clone as
the depth variable in git_transport_options struct (file transport.h)
uses value 0 for another meaning, so it would have need changes at
all places, where the transport options depth is being used 
(e.g. fetch)

So I documented the current behavior, see attached patch.

Stefan Beller (1):
  Documentation on depth option in git clone.

 Documentation/git-clone.txt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

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1.8.1.80.g3e293fb.dirty