documenting use of git submodule

[Eric Blake]

Given the recent commit to describe how to use a moderate approach,
where some, but not all, gnulib files are checked into version control,
I was inspired to re-read the section about the minimalistic approach.
Any objections to this patch?  Should I add more details on git commands
used for creating an initial gnulib submodule, as well as ideas on how
to update the submodule to newer gnulib commits?

-- 
Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

gnulib.patch1
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