Re: [PATCH] Documentation/git-submodule.txt: Add Description section

Petr Baudis [off-list ref] writes:

Figuring out how submodules work conceptually is quite a bumpy
ride for a newcomer; the user manual helps (if one knows to actually
look into it), but the reference documentation should provide good
quick intro as well. This patch attempts to do that.

Good discussion starter, I think.  There seem to be a few technical
inaccuracies though.

I'll wait until the people interested in submodules on the list form
consensus on the wording and contents.