Re: [PATCH v2] Documentation/git: fix stale "MULTIPLE CHECKOUT MODE" reference

Duy Nguyen [off-list ref] writes:

The flexibility here is not about extending this feature per se but
maybe trying out an entirely different setup. Yes a bunch of safety
nets are thrown out of the window if you try it. I guess I still had
the 2005 mindset when I designed this. If there is no strong objection
to $GIT_COMMON_DIR, I suggest we keep it until we sort out the
submodule problem.

OK, let's revisit this after we finish futzing with the submodule part.