[MERGE] Update 'uncommit' docs

[John Arbash Meinel]

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Aaron Bentley wrote:
| Hi all,
|
| Here's a little patch to update the uncommit docs.  A friend pointed out
| that the documentation doesn't make it clear that uncommit leaves the
| working tree alone.  He said the bit about generating bundles in the
| future actually made him think that uncommit *would* change the working
| tree.
|
| Aaron

BB:approve

Probably more could be said, but this looks fine to me.

John
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