The discussion on `--rebase-merges` documentation [1] noted the
variety of terminologies that could be used when looking at commit
history.

This change consolidates the current colloquial use of 'flatten' as
a synonym for the linearizing of commit sequences, and notes some
of the potential misunderstandings.

Philip

Philip Oakley (2):
  doc: Glossary, describe Flattening
  cover-letter: flatten


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2.40.0.windows.1