commit-graph: remove Future Work section

The commit-graph feature began with a long list of planned
benefits, most of which are now complete. The future work
section has only a few items left.

As for making more algorithms aware of generation numbers,
some are only waiting for generation number v2 to ensure the
performance matches the existing behavior using commit date.

It is unlikely that we will ever send a commit-graph file
as part of the protocol, since we would need to verify the
data, and that is expensive. If we want to start trusting
remote content, then that item can be investigated again.

While there is more work to be done on the feature, having
a section of the docs devoted to a TODO list is wasteful and
hard to keep up-to-date.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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