partial-clone: render design doc using asciidoc

Rendered documentation can be easier to read than raw text because
headings and emphasized phrases stand out.  Add the missing markup and
Makefile rule required to render this design document using asciidoc.

Tested by running

  make -C Documentation technical/partial-clone.html

and viewing the output in a browser.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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