[MERGE] Explain revision/range identifiers

[Aaron Bentley]

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John Arbash Meinel wrote:
> most people think diff & merge consider it open ended (include
> one end, not the other.)

If we were changeset-oriented, it would be true.  But I don't see any
value in perpetuating that misperception.  To diff, a range denotes two
states, and the output compares them.

Aaorn
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